European Journal of Education Studies
ISSN: 2501 - 1111
ISSN-L: 2501 - 1111
Available on-line at: www.oapub.org/edu
Volume 3 │Issue 5 │2017
doi: 10.5281/zenodo.574666
EFFECTS OF SEQUENTIAL TEACHING METHODS ON
RETENTION OF KNOWLEDGE IN BIOLOGY BY
SECONDARY SCHOOL STUDENTS IN KENYA
Namasaka, Fred Wafula1i,
Helen Omondi Mondoh2,
Chrilukovian B. Wasike3
Department of Curriculum, Instruction and
1
Educational Technology, Pwani University, Kenya
PhD, Department of Curriculum, Instruction and
2
Educational Technology, Pwani University, Kenya
Department of Animal Science,
3
Maseno University, Kenya
Abstract:
Despite the importance of knowledge in Biology, candidates’ performance at the
national examination, The Kenya Certificate of Secondary Education (KCSE) is poor.
This could be attributed to the teaching methods. The purpose of this study was to
compare differential effectiveness of Sequential Teaching Methods (STM) on the,
retention of knowledge in Biology by secondary school students. The study was Quasiexperimental using the Non-equivalent control- group 16 study design. The target
population comprised students in the 18 old category National Schools in Kenya that
were in existence before 2012. Purposive sampling was used to obtain a sample of eight
(8) schools and 402 Students. The students in the eight (8) sub-groups were taught the
same Biology topic: ‚General Characteristics of Enzymes‛, using different sequences of
three teaching methods namely: lecture, slide demonstration and laboratory (student
experiment). Group I (ELD) began with experiments, followed by lecture method and
was lastly shown, animated slides. The sequence of the three different methods used in
the first group was altered in both the second and third groups as follows: The lecture
method, slide demonstration and laboratory experiment (LDE) for Group II, and slide
demonstration, experiment and lecture method (DEL) for group III. Students in group
IV (control group) were taught using (oral-only) lecture method. The teachers gave
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© 2015 – 2017 Open Access Publishing Group
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Namasaka, Fred Wafula, Helen Omondi Mondoh, Chrilukovian B. Wasike
EFFECTS OF SEQUENTIAL TEACHING METHODS ON RETENTION OF KNOWLEDGE IN BIOLOGY BY
SECONDARY SCHOOL STUDENTS IN KENYA
lectures and performed slide demonstration while the students carried out laboratory
experiments. The test was used as a pre-test and also as a retention test that was
administered 40 days after the Post-test BAT. This test had 25 objective questions testing
knowledge of facts, application of knowledge and problem solving ability. To measure
Retention of Knowledge, the researcher used Biology Retention Test (BRT). The
research hypothesis was tested using ANOVA at significant level of 0.05. The results
and findings of the study show that STM, when efficiently used in instruction, enhance
immediate retention of knowledge in Biology more effectively than the oratory lecture
method predominantly used in Kenyan Secondary schools. Furthermore, DEL sequence
was identified as the most effective in comparison to LDE and ELD. The findings of the
study will help curriculum developers and teachers to choose the most appropriate
sequence to use in Biology.
Keywords: sequential teaching, retention of knowledge, secondary school, Kenya
1. Background of the Study
Biology education has both intrinsic and extrinsic justifications (Brown, 1995). The
former relates to advancement in Biology for its own sake as a discipline while the latter
is concerned with the promotion of societal welfare. Inferably, the teaching and learning
in Biology play both academic and social roles. Killermann (1998) explains that the
academic role concerns the acquisition of scientific knowledge, skills and attitudes for
application in the fields of medicine and agriculture among others. The social role
pertains to the empowerment of individuals in economic and technology related areas.
The overall goal of teaching Biology in Kenya is to make learners to fully understand
themselves and the environment (Maundu, Sambili & Muthwii, 1998). The teaching of
Biology therefore, aims at the production of a scientific community whose major role is
to promote the welfare of humankind through application of knowledge in Biology. In
addition, Biology fosters the advancement of science through research and publications
(Lawson, 2001). .
In an attempt to achieve objectives of the Secondary School Biology syllabus, KIE
(2006) suggested several methods of teaching. The methods include: practical work,
class discussions, demonstrations, excursion/field trips and project work. However, the
baseline survey done by the project, ‘Strengthening of Mathematics and Science in
Secondary Education’ (SMASSE, 2007), shows that the predominantly used teaching
methods
for
Biology
include:
lecture
method,
teacher
demonstration
and
practical/laboratory work (student experiment). The Biology syllabus in Kenya is
European Journal of Education Studies - Volume 3 │ Issue 5 │ 2017
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Namasaka, Fred Wafula, Helen Omondi Mondoh, Chrilukovian B. Wasike
EFFECTS OF SEQUENTIAL TEACHING METHODS ON RETENTION OF KNOWLEDGE IN BIOLOGY BY
SECONDARY SCHOOL STUDENTS IN KENYA
organised in such a way that for most theory lessons, mainly taught through the lecture
method, there is corresponding practical work. The recommendation by KIE (2006) is
that practical or laboratory work should be done through either teacher demonstration
or student experiments; allowance is made for practical lessons to be done before or
after theory lessons. This in effect constitutes Sequential Teaching Methods Approach
(STMA). However, in actual fact, Biology teachers in Kenya often use only lecture
method (without demonstrations and experiments) in their lessons (Njuguna, 1998).
Any attempt of STMA in teaching Biology in Kenya mainly follows the sequence:
lecture method, teacher demonstration and student experiments (LDE). It is however,
important that these methods be used in an appropriate sequence (pattern). In an effort
to help the teachers implement the Biology syllabus effectively, emphasis is laid on the
teachers’ use of a combination of methods for a single topic (KIE, 2006). However, this
may not be practically possible due to constraints such as lack of material resources and
even space that curtail use of variety of teaching methods.
Biology teachers usually resort to use of lecture method owing to the
aforementioned constraints. Consequently, learners miss the hands–on experiences,
which enhance learning. The result is rote memorisation of information as opposed to
meaningful learning. Mondoh (2005) observes that, in most lessons the whole difference
lies in the fact that the student is asked to accept from outside an already organised
intellectual discipline which he/she may or may not understand. Teaching method has
been singled out as an important factor that determines learning outcomes (Trumper,
2006). It fosters or hinders learning. The teaching method used therefore affects
achievement, retention and transfer of knowledge.
Research conducted by Wachanga & Mwangi, (2004) in Kenya to find out effects
of various teaching methods on achievement in science subjects shows that cooperative
class experiment as a teaching method enhances learners’ achievement and motivation
in Chemistry and Agriculture respectively. The findings of another study by Kibett and
Kathuri (2005) involving secondary school students in Nakuru County showed that
learners who were taught Agriculture using the project method performed better than
their counterparts who were taught using the regular approach, mainly by lecture. In a
related study, Orora, Wachanga and Keraro (2005) found that the cooperative Concept
Mapping teaching method enhanced achievement and motivation in secondary school
Biology in Gucha County, Kenya. Other studies (Johnson, 1991; Odubunmi & Balogun,
1991; Killermann, 1998; Esra, Ijlal and Ocak, 2009) have been carried out to determine
the effectiveness of different methods of teaching Biology. The findings of these studies
show that the methods of laboratory and slide demonstration are very effective in
teaching Biology.
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Namasaka, Fred Wafula, Helen Omondi Mondoh, Chrilukovian B. Wasike
EFFECTS OF SEQUENTIAL TEACHING METHODS ON RETENTION OF KNOWLEDGE IN BIOLOGY BY
SECONDARY SCHOOL STUDENTS IN KENYA
Research done by Esra, Ijilal and Ocak (2009), conducted in Turkey at Arturk
University sought to determine the effect of Sequential Teaching Methods in Biology,
on students’ achievement and retention. The study aimed at determining the effects of
Sequential Teaching Methods under three teaching modes; lecture, slide demonstration
and laboratory (student experiment) on academic achievement, retention and transfer
of knowledge in Biology by learners.
However, all the aforementioned studies involved a single teaching method
except the study by Esra, Ijilal and Ocak (2009) who used a combination of methods.
Their study is in line with KICD’s suggestion on effective methods of teaching Biology;
hence the interest of the researcher in this study.
The current study is a replication of the aforesaid study but with some
adjustments. Esra’s study was quasi- experiment that used only three non-equivalent
groups. The present study used four groups. In addition, a control group that was
taught using oral-only lecture method was also included. This study therefore, aimed at
finding out the effects of Sequential Teaching Methods (STM) on secondary school
students, retention of knowledge of Biology in Kenyan National schools.
According to the reports by the Kenya National Examination Council (KNEC
2007-2012) , the KCSE mean scores in Biology for the period 2007 to 2010 were as
follows: 2007- 44% ; 2008- 30% ; 2009- 27%; 2010- 29%; 2011- 32% and 2012-26%).
Accordingly, performance was influenced by many factors but the magnitude of each
factor was not known. This research sought to put things in perspective instead of
speculation.
2. Statement of the Problem
Despite the government’s effort to review curriculum as well as change the examination
format, students’ performance in the KCSE Biology National examination continues to
decline. Low achievement in Biology at KCSE examinations may imply that the
information given is not sufficiently retained in future years of study and not
consequently transferred for general use in life. Studies by (Wachanga & Mwangi, 2004;
Kibet and Kathuri 2005; Orora, Wachanga and Keraro 2005: Esra, Ijlal and Ocak 2009)
have been carried out in Kenya and elsewhere to compare effects of teaching methods
on academic performance. These studies observed that teaching methodology is a
crucial factor in determining academic performance of students. Mills (1991), observes
that the teaching methodology is a crucial factor that affects academic achievement of
students. Esra, Ijlal and Ocak (2009) suggested that the sequence of teaching methods
affected performance. The Kenya 8-4-4 Biology syllabus recommends use of STM; this
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Namasaka, Fred Wafula, Helen Omondi Mondoh, Chrilukovian B. Wasike
EFFECTS OF SEQUENTIAL TEACHING METHODS ON RETENTION OF KNOWLEDGE IN BIOLOGY BY
SECONDARY SCHOOL STUDENTS IN KENYA
has six possible combinations of sequences-LDE, LED, ELD, DLE and DEL.
Information based on empirical studies on whether the STM was effective, and which
sequence had greatest effect on academic performance in Biology in the Kenyan context
was lacking. The determination of the best sequence was also important. However, a
study on STM based on Kenyan conditions had not been conducted. The study
therefore sought to address the problem of determining whether STM was an effective
method of teaching Biology, and identifying the best sequence on retention of
knowledge.
2.1 Purpose, Objective and Hypothesis of the Study
The purpose of the study was to determine which sequence (pattern) of the three
Sequential Teaching Methods (lecture, demonstration and experiment) must take
precedence in order to increase learners’ retention of knowledge (remembrance). As
such, the study sought to evaluate differential effectiveness of three versions of
Sequential Teaching Methods namely; ELD, DEL and LDE. The objective therefore was,
to: compare the retention of Knowledge of learners taught Biology using different
sequences of Sequential Teaching Method. The null hypothesis (Ho2) tested was: There
is no difference in retention of knowledge in Biology when learners are exposed to
different sequences of teaching methods.
2.2 Theoretical Framework
The study was guided by two theories: [1] the General Systems Theory proposed by
Bertalanfty (1968). Noting that a system is an interrelationship of various elements
which work in unison to achieve a designated goal, each element or variable in the
system has its own specific roles to perform. Based on the General Systems Theory, the
teaching in Biology involves elements that include the teacher, learners, teachinglearning process, teaching-learning resources and physical facilities such as the
classroom. The current study involves independent, dependent and extraneous
variables. All these variables must interact with each other in order to move the system
from an input condition of original or entry behaviour to an output condition of
modified behaviour. The expected modified behaviour, for instance higher, retention of
knowledge serves as the goal of the system whereas actual retention serves as feedback
of the teaching process. The General Systems Theory guided the conceptual framework.
[2] The Cognitive Load Theory of learning proposed by Sweller (1994). According to
this theory, the working memory is finite and has limited capacity. The information
received through the auditory channel gets direct access to the working memory thus
clogging it. This affects information processing.
European Journal of Education Studies - Volume 3 │ Issue 5 │ 2017
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Namasaka, Fred Wafula, Helen Omondi Mondoh, Chrilukovian B. Wasike
EFFECTS OF SEQUENTIAL TEACHING METHODS ON RETENTION OF KNOWLEDGE IN BIOLOGY BY
SECONDARY SCHOOL STUDENTS IN KENYA
The treatment given to the learners in the study was based on this theory; the
human working memory has a threshold of 4 to 10 elements making some material
difficult to learn. Sweller (1994), provided evidence that the cognitive load of some
learning material can be greatly reduced if the information is presented pictorially or
otherwise as in the case of lecture and slide demonstration.
2.3 Conceptual Framework
Several factors or variables interact and affect learning. The variables could be
categorised as extraneous, independent and dependent. These variables and their
interactions constitute the conceptual model of this study. The conceptual framework
that guided this study is based on the General Systems Theory. Accordingly, the
teaching and learning process has inputs and outputs. Therefore, in order to achieve
good academic results, the input should have appropriate instructional methods.
Damico and Roth (1994) noted that quality education is defined in terms of output such
as the number of students passing an important national examination. Thus, a school of
students with low achievement scores is said to be of low quality or non-performing.
However, Fowler (1995) observed that “a diagnosis of school quality problem that focuses on
outputs such as student performance fails to inform about the antecedent causes such as teaching
methods.”
Arguably, learning outcomes are influenced by several factors. In the study,
these included both learner and teacher characteristics which, and constituted
extraneous variables that had to be controlled. As explication, the learners’ age
determines what they are to be taught. Teacher’s qualifications and training on the
other hand determine the instructional approach that a teacher would prefer to use
more often and how effective the teacher would use the approach. Gender of learners
was an extraneous variable which could not be controlled but whose effect could also
not be ignored.
The conceptual framework shows the relationship of variables for determining
the effects of using sequential teaching methods on secondary school students’
achievement, retention and transfer in Biology knowledge. The framework is
represented diagrammatically in Figure 1.
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Namasaka, Fred Wafula, Helen Omondi Mondoh, Chrilukovian B. Wasike
EFFECTS OF SEQUENTIAL TEACHING METHODS ON RETENTION OF KNOWLEDGE IN BIOLOGY BY
SECONDARY SCHOOL STUDENTS IN KENYA
Figure 1: The Conceptual Framework
Dependent variables
Independent
variables
Achievement in
Biology (score on
BAT)
Retention in
Biology (Score on
BKRT).
Transfer of Knowledge
In Biology (score on
Concept Maps)
Extraneous variables
Sequential
Teaching
Met hods
o ELD
o LDE
o DEL
Age of learners
Gender of learners
Teacher Qualifications
In service Training of
teachers (SMASSE)
3. Research Methodology
This study was quasi-experimental, using the Non-equivalent Control-Group Sixteen
study design. It was found suitable for controlling all the threats to internal validity. All
the four groups took a pre-test, post-test, knowledge retention test and transfer test
hence a total of 16 observations were made. All the sixteen observations made were
used to generate estimations of the effect of the experimental treatment, interactive
testing variables and that of the control variables. The general model of the study
design is represented in Figure 2.
Group I
O1
X
O2,
O3,
O4
Group II
O5
X
O6,
O7,
O8
Group III
O9
X
O10,
O11,
O12
Group IV
O13
C
O14,
O15,
O16
Figure 2: General Model of the Non-equivalent Control- Group 16 Study Design
Source: Adapted from Tables 8.3 and 8.4 in John W. Creswel, ‚Research Design, 3rd
edition, Sage Publications New Delhi, 2011. pp 160
Where:
O1, O5, O9 and O13 are pre-tests;
O2, O6, O10 and O14 are post-tests;
O3, O7, O11 and O15 are retention – tests;
O4, O8, O12 and O16 are Transfer-tests.
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Namasaka, Fred Wafula, Helen Omondi Mondoh, Chrilukovian B. Wasike
EFFECTS OF SEQUENTIAL TEACHING METHODS ON RETENTION OF KNOWLEDGE IN BIOLOGY BY
SECONDARY SCHOOL STUDENTS IN KENYA
X is the treatment where students were taught using sequential teaching
methods (STM) C- means no treatment. It refers to the control group:
Group I was the experimental group that received the pre-test, the treatment
(X=ELD), the post-test, the retention test and the transfer test.
Group II was the experimental group that received the pre-test, the treatment
(X=LDE), the post test, the retention test and the transfer test.
Group III was the experimental group that received the pre-test, the treatment
(X=DEL), the post test, the retention test and the transfer test
Group IV was the control group that received the pre-test, followed by the
control condition (C=OOL), the post test, the retention test, and lastly the transfer test.
Quasi experimental design was used because the classes were naturally formed in the
school and remain intact during the study. The classes were randomly assigned to
teaching methods (LDE, ELD and DEL) with oral-only lecture method as a control
variable. The aim was to evaluate differential effectiveness of STM based on testing of
the hypotheses.
Note: The study had several objectives but only one is singled out for purposes
of this paper.
The design was suitable for testing and establishing the cause-and-effect
relationship between Sequential Teaching Methods and Retention of Knowledge.
According to Sekeran and Bougie (2011), the design allows for manipulation of the
independent variable so that the extent of its causal effects could be established. This
design is the most comprehensive and also guarantees maximum internal and external
validity, ruling out many other rival hypotheses. The study was analytical and
predictive in nature. The research process was thus manipulative not enumerative. It
was a snapshot or cross-sectional study where sufficient data was collected at one point
in time. Form One classes were used as the unit of analysis.
3.1 Sampling Techniques and Sample Size
The unit of sampling in this study was the secondary school rather than individual
students. This means therefore that each school was considered as one sub-group. The
school sample was drawn through multi-stage sampling, from 18 Old Category
National schools.
First, the schools were divided into four clusters according to the regions where
they are located. The 18 National secondary schools were visited to ascertain their
suitability for the study. The criteria for suitability included qualifications, training and
performance index (mean score) of subject in Biology for the teachers in the schools.
Participating schools from the four clusters were then selected by purposive sampling
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Namasaka, Fred Wafula, Helen Omondi Mondoh, Chrilukovian B. Wasike
EFFECTS OF SEQUENTIAL TEACHING METHODS ON RETENTION OF KNOWLEDGE IN BIOLOGY BY
SECONDARY SCHOOL STUDENTS IN KENYA
after identifying schools categorised as boy’s only schools or girls only school.
Purposive sampling was used to select the schools that finally constituted the sample of
the study.
3.2 Sample Size
The actual schools sample consisted of eight Old Category National schools (four boys
and four for girls). A participant sample of 402 learners was purposefully identified
from the school sample. The reason was to cater for both gender and regional
representation. Summary is given in Table 1:
Table 1: Sample Size
Group
Gender
Male
Total
Female
1
51
51
102
2
46
51
97
3
53
51
104
4
58
41
99
Total
208
194
402
The sample size was determined by the enrollment in the schools selected. The
selection was done on the basis of location, syllabus coverage, willingness to cooperate
and gender balance. Since gender was an aspect to be investigated, four of these schools
were boys only schools while the other four were girls only schools. Fraenkel and
Wallen (2000) recommend at least 30 subjects per group. The sample size as shown in
Table 1 was thus adequate for the study.
3.3 Instrumentation
In this study three tools were used for data collection.
A. Pre-test BAT
This tool was an adoption of the test developed by Esra, Ijlal and Ocak in 2009. The test
items exhaustively covered the topic ‘enzyme activity’. The test duration was one hour,
and taken individually. It contained 25 multiple choice items, each with five distractors.
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Namasaka, Fred Wafula, Helen Omondi Mondoh, Chrilukovian B. Wasike
EFFECTS OF SEQUENTIAL TEACHING METHODS ON RETENTION OF KNOWLEDGE IN BIOLOGY BY
SECONDARY SCHOOL STUDENTS IN KENYA
B. Post-test BAT
The Post-test BAT was similar to the pre-test BAT except for the order of questions. The
test was also taken by individual learner and scored using a marking scheme and
Scores were expressed as a percentage.
C. The Biology Knowledge Retention Test (BKRT)
The BKRT was designed by changing the order of the test items in the post Test BAT. It
was administered 40 days after the post-test BAT. BKRT was also taken by individual
learners over duration of one hour. It was scored using marking scheme. The scores
were expressed as a percentage.
3.4 Data Collection Procedure
Data for this study was collected between May and July 2013. The researcher trained the
teachers in Biology on how to administer the treatment. Each trained teacher was
provided with a teaching manual with content of the topic and other teaching and
learning resources. In addition, the pre-test BAT was administered by teachers to the
four groups of learners in order to determine homogeneity in their knowledge of the
topic ‚Enzymes,‛ as well as similarity in learning ability. Treatment was given over a
period of two weeks and was administered by the teachers. Biology Knowledge
Retention Test (BKRT) was administered by teachers 40 days after administration of the
BAT post – test). BKRT was also a one hour sit–in individual test. This was to gather
numerical and quantitative data from the learners to compare knowledge retention of
different sequences of STM. BKRT had the same items and response format as BAT, the
only change being order or sequence of questions. Similarly, BKRT was used to obtain
raw test scores as a measure of retention. According to Sisson, Swartz and Wolf (1992),
knowledge retention rate is highest (>85%) immediately after learning but generally
falls to 75% of its original level 3 months after original learning. Therefore 1½ months is
assumed optimum period for assessing short – term retention of knowledge and
expecting more than 85% level of retention.
3.5 Data Analysis
The score sheets for the pre-test, BAT, BKRT were all checked and edited for accuracy
and consistency. They were categorised according to groups. Data coding was done to
conceal identity of study groups. The analysis involved one-way and two- way Analysis of
Variance (ANOVA), using the univariate general linear model. This type of ANOVA was
suitable for estimating the effect of multiple independent variables such as teaching methods on
one dependent variable such as retention. The method was used to assess the mean differences
European Journal of Education Studies - Volume 3 │ Issue 5 │ 2017
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Namasaka, Fred Wafula, Helen Omondi Mondoh, Chrilukovian B. Wasike
EFFECTS OF SEQUENTIAL TEACHING METHODS ON RETENTION OF KNOWLEDGE IN BIOLOGY BY
SECONDARY SCHOOL STUDENTS IN KENYA
between the four groups. Nassiuma and Mwangi (2004) affirm that ANOVA is a useful
technique in research where multiple sample cases are involved. The Null Hypotheses were tested
at the 0.05 significance level Data consisted of scores on BKRT. The Means and standard error
calculated from the raw scores of the BKRT constituted the descriptive statistics. A Two-way
ANOVA was used in data analysis Tukey’s post-hoc comparisons were carried out to show mean
separation in order to determine where the significance in difference between the means had
occurred.
4. Results, Interpretation and Discussion
It was necessary to find out the effect of teaching methods and gender as well as their
interaction on the retention of knowledge. The measure of retention is the score
obtained on BKRT. The results of a two-way (ANOVA) of effect of interaction between
STM, and gender, based on mean scores of the BKRT for the four groups are presented
in Table 2.
Table 2: Two-Way ANOVA of Effect of Teaching Methods and
Gender on Retention
Independent Variable
Ss
Df
Ms
F
Sig
7943.27
85.26
0.000
7062.98
75.81
0.000
1.87
0.135
of
STM
(N-I)
Teaching Method
23829.82
Gender
7062.98
Gender interacting with Teaching Method
3
1
521.43
3
173.81
36708.61
394
93.17
974080
402
Error
Total
A
significant
effect
was
found
among
the
sequences
(F(3,394)=85.26,p<.05). The interaction between teaching methods and gender had no
significant effect on retention of knowledge (F= (3,394) =1.87, p<.05). The null hypothesis
which stated that ‘there is no statistically significant difference in retention in Biology
when learners are taught using different sequences of lecture, demonstration and
experiment methods’ was thus rejected.
The results of ANOVA suggest that the treatment had significant overall effect.
The results also indicate significant difference between treatment groups. It was thus
necessary to perform Tukey’s post hoc comparisons to determine where the differences
exactly occurred. The results of mean separation are presented in Table 3.
European Journal of Education Studies - Volume 3 │ Issue 5 │ 2017
726
Namasaka, Fred Wafula, Helen Omondi Mondoh, Chrilukovian B. Wasike
EFFECTS OF SEQUENTIAL TEACHING METHODS ON RETENTION OF KNOWLEDGE IN BIOLOGY BY
SECONDARY SCHOOL STUDENTS IN KENYA
Table 3: Tukey’s Post Hoc comparison of the retention test scores on the BKRT
Group(i)
Group (j)
n(i)
Mean score (i)
Mean diff (i-j)
P value
1
1
102
45.65± 1.321
-
-
1
2
-
-
-3.92
0.010
1
3
-
-
-12.43
.000
1
4
-
-
9.69
.000
2
2
97
49.57± 1.311
-
-
2
3
-
-
8.51
.000
2
4
-
-
13.61
.000
3
3
104
58.08± 1.145
-
-
3
4
-
-
22.12
.000
4
4
99
35.96± 1.211
-
-
The results show that there was significant difference between group means. That is, the
retention mean score of groups 1, 2, 3 and 4 were all different at 0.05 level. Group 3
(DEL) had the highest retention score at 58.08 compared to group 2 (LDE) and group 1
(ELD) whose means scores were 49.57 and 45.65 respectively. Group 4 (Control) had the
lowest mean at 35.96. Since the interaction of teaching methods and gender was not
significant, there was no need to perform a one-way ANOVA for each gender
separately.
The results in Table 3 point to the following findings:
i.
The use of STM led to improved retention of knowledge compared to use of oralonly lecture method.
ii.
DEL sequence mean scores were highest on BKRT
iii.
Gender had significant effect on retention with female learners scoring higher
than their male counterparts.
iv.
Interaction of teaching method (STM) and gender showed no significant effect on
retention of knowledge.
4.1 Effects of STM on Students’ Retention of Knowledge in Biology
Aziz (1990) perceives retention as storage, the process of holding encoded information
in memory. The results presented in Table 3 show that students who were taught
through the STM had significantly higher scores in the Biology Knowledge Retention
Test (BKRT) than those taught using the oral-only lecture method. This therefore,
implied that the STM was more effective in enhancing students’ retention of knowledge
than the oral-only lecture method. STM ensures maximum utilisation of most parts of
the memory. The study also sought to determine the best sequence of the STM that
would lead to highest retention levels. To address this, students’ retention of content
material relative to the three sequences was analysed. The analysis of results indicated
European Journal of Education Studies - Volume 3 │ Issue 5 │ 2017
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Namasaka, Fred Wafula, Helen Omondi Mondoh, Chrilukovian B. Wasike
EFFECTS OF SEQUENTIAL TEACHING METHODS ON RETENTION OF KNOWLEDGE IN BIOLOGY BY
SECONDARY SCHOOL STUDENTS IN KENYA
that the students who were taught through the DEL sequence obtained significantly
higher scores in the BKRT than those who were taught through the LDE and ELD
sequences. Perhaps DEL provides the best pattern for elaborative rehearsal of
information. DEL seems to enhance attention to information while in the working or
short term memory. Sisson et al (1992) provide literature on clinical information with
regard to knowledge retention of material taught and examined in Biology. However,
the history of research on retention is fairly recent. It is rather unfortunate that in
education a great deal of time and effort is devoted to the acquisition of knowledge but
very little is known about how long this knowledge is retained. Addressing this issue
has practical relevance to educational policy and practice. It also has implications for
theoretical models of memory and knowledge representation.
The first attempt to address the issues about the retention of formally acquired
knowledge was reported by Bahrick (1984). He found a strong relationship between
retention and the initial depth of learning. Nevertheless, his study laid a strong
foundation upon which subsequent researches were conducted in various specific
disciplines, Biology Education included. Results of a study done by Esra et al. (2009),
focusing on effects of STM on retention in Biology, showed higher retention level in
lessons beginning with experiment or slide demonstration as opposed to lecture
method. Their findings agreed with results of previous researches that laboratory work
offer students hands-on-experience thus enhancing their remembrance to 90%.
Similarly, the present research findings agree with Esra’s slide demonstration but differ
on the aspect of experiment. Esra et al. (2009) reported that student comprehension is
enhanced with lesson started with experiment, because laboratory activities increase
students’ interest in the topic. They seem not to have taken into account the impact of
the nature of knowledge as well as its representation. Maslow’s Theory of learning
highlighted the differences between experimental knowledge, procedural knowledge,
theoretical and spectator knowledge. Similarly, the difference in learner’s retention may
not only be in the method but also in the dimension or domain of knowledge. For
example, dimensions or domains of knowledge in Biology include Anatomy,
Physiology, Morphology and Histology. The most effective method is one that can
represent the specific domain of knowledge in a transparent manner for learners to see.
In the present study, animated slide demonstration is a more effective
instructional compliment for teaching processes or mechanisms in Biology. This view is
strongly supported by O’Day (2009), who observed that on retention, animated slide
demonstration rival and at times surpasses the pedagogical value of lab work. This is
true especially when dealing with knowledge that involves a physiological process or
mechanism.
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The aspect that needs to be addressed is: How students could learn about the
mechanism of enzyme action through laboratory work and what the students were
supposed to observe. It was not enzyme activity itself but rather mere effect of enzyme
activity. Pedagogically, learning about enzyme action can only be inferred through
experiment. Animated slide demonstration therefore, provided for direct observation of
the mechanism, hence better understanding and higher retention.
Inquiry-based laboratory approaches are more effective than verification
approaches (Opara 2011). In this study, start of lesson with experiment was probably
less effective because it focused on verification as opposed to discovery of concepts and
observation of actual mechanism of enzyme activity.
Applying Cognitive Load Theory to teaching, learning will be maximised by
ensuring that as much of a learner’s working memory as possible is free to attend only
to encoding to-be-learned information. Accordingly, lecture method imposes a
relatively high level of cognitive load (Sweller, 1994). On the other hand, the major
weakness of laboratory experiments in teaching a psychological process such as enzyme
action is that learners may successfully carry out the practical, yet effectively learn
nothing. Slide demonstration impose very low levels of cognitive loads thus facilitate
learning (Mousavi, Low & Sweller, 1995). While use of DEL sequence provided an
effective alternative to both LDE and ELD sequences, it can be argued that perhaps DEL
fosters original learning, which in turn is determinant of retention. This effect could be
attributed to reduced cognitive load when visual presentations (animations) are used in
the beginning. In conclusion, DEL sequence has been demonstrated to be highly
effective at improving retention of psychologically based content such as enzyme
activity in Biology. The association between concepts and the motion in the graphic is
clearly indicated in slides. This is necessary for construction of meaning.
The laboratory work and class experiments have a redundancy effect since they
only show the presence of catalase enzyme in cells, effects of pH and temperature on
enzyme activity, but do not show the typical or real mechanism of enzyme action on
substrate to yield products. Use of DEL is thus encouraged since it also has a positive
effect on transfer of knowledge in Biology (see the subsequent section for a detailed
explanation of this subject).
4.2 Gender-based Effect on Retention of Knowledge in Biology
The results of this study indicate that there is a significant difference in retention of
knowledge between male and female learners at .05 level. This could be attributed to
the difference in original learning as reflected in achievement scores. A comparison
between mean scores of male and female learners on BKRT reveals that female learners
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Namasaka, Fred Wafula, Helen Omondi Mondoh, Chrilukovian B. Wasike
EFFECTS OF SEQUENTIAL TEACHING METHODS ON RETENTION OF KNOWLEDGE IN BIOLOGY BY
SECONDARY SCHOOL STUDENTS IN KENYA
scored significantly higher than their male counterparts. The effect of original learning
was therefore positively carried forward to the retention of knowledge. Although a few
studies have been undertaken to investigate gender-based effect on retention of
knowledge, so far scanty literature is available. The present study therefore attempted
to bridge the knowledge gap on gender differences in retention of knowledge of
Biology.
4.3 Effect of STM Interacting with Gender on Retention of Knowledge
The results showed that although both STM and gender separately had significant effect
on retention but the interaction between the two indicated that there was no significant
effect. The findings also revealed that different versions of STM differ with respect to
their effect on retention of knowledge in Biology. Furthermore, the female gender
appeared to retain more of the knowledge learned. The insignificant interaction effect of
STM and gender could be attributed to other factors beyond the scope of the present
study. It could perhaps be due to the nature in Biology subject, which includes many
abstract concepts events, sub-topics and facts that students have to learn. These,
according to Trumper (2006), pose learning difficulties at individual learner’s level.
5. Summary, Conclusions and Recommendations
The use of STM led to improved retention of knowledge compared to the use of oralonly lecture. There was also a significant difference in students’ retention of knowledge
in Biology between students taught using different sequences of STM. DEL sequence
results were highest (58.08%) on Biology knowledge retention test.
The teaching philosophy emerging from the findings of this study is that, each
teaching method used yielded some amount of learning. The use of a combination of
teaching methods sequentially enhances mastery and meaningful learning. This is
characterised by high achievement, retention and transfer of knowledge. A combination
of teaching methods is more effective due to complementarity and the supplementary
role that each plays. Each method of teaching has its own strengths and weaknesses.
The effects vary depending on the position of a particular method in the specific
sequence of teaching. Thus, the first method in the sequence determines the amount of
original learning that occurs.
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EFFECTS OF SEQUENTIAL TEACHING METHODS ON RETENTION OF KNOWLEDGE IN BIOLOGY BY
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6. Recommendations at the pedagogical level
(1) The KICD should formulate new policy guidelines laying emphasis on use of
Sequential Teaching Methods as a means to improve learners conceptual
understanding of knowledge in Biology especially that concerned with
physiological processes or mechanisms such as ‘enzyme action’.
(2) Universities, colleges and CEMASTEA should improve on the existing policy on
implementation in Biology syllabus by training and retraining teachers on use of
STM. This could be done through workshops, seminars, conferences and training
programs. Animated Slide Demonstration Experiment-Lecture (DEL) sequence is
highly recommended.
(3) Universities and colleges should focus on training for innovative teaching rather
than knowledge.
7. Recommendations for Further Research
The question that remains unanswered by the study is how the same sequence (DEL)
affects knowledge relating to Anatomy, Histology and Morphology.
The recommendation in this regard, is that research be carried out to explore the
effects of STM (DEL, LDE and ELD) on retention in relation to different kinds of
knowledge in Biology such as Physiology, Anatomy, Morphology and Histology.
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