HCI 3e - Ch 14: Communication and collaboration models

chapter 14 communication and collaboration models

CSCW Issues and Theory All computer systems have group impact not just groupware Ignoring this leads to the failure of systems Look at several levels – minutiae to large scale context: face-to-face communication conversation text based communication group working

Face-to-face communication Most primitive and most subtle form of communication Often seen as the paradigm for computer mediated communication?

Transfer effects carry expectations into electronic media … … sometimes with disastrous results may interpret failure as rudeness of colleague e.g. personal space video may destroy mutual impression of distance happily the `glass wall' effect helps

Eye contact to convey interest and establish social presence video may spoil direct eye contact (see video tunnel, chap 19) but poor quality video better than audio only

Gestures and body language much of our communication is through our bodies gesture (and eye gaze) used for deictic reference head and shoulders video loses this So … close focus for eye contact … … or wide focus for body language?

Back channels Alison: Do you fancy that film … err 1 … `The Green' um 2 … it starts at eight. Brian: Great! Not just the words! Back channel responses from Brian at 1 and 2 quizzical at 1 affirmative at 2

Back channels (ctd) Back channels include: nods and grimaces shrugs of the shoulders grunts and raised eyebrows Utterance begins vague … … then sharpens up just enough

Back channels -media effects Restricting media restricts back channels video – loss of body language audio – loss of facial expression half duplex – lose most voice back-channel responses text based – nothing left!

Back channels and turn-taking in a meeting … speaker offers the floor (fraction of a second gap) listener requests the floor (facial expression, small noise) Grunts, ‘ um ’s and ‘ ah ’s, can be used by the: listener to claim the floor speaker to hold the floor … but often too quiet for half-duplex channels e.g. Trans-continental conferences – special problem lag can exceed the turn taking gap … leads to a monologue!

Basic conversational structure Alison: Do you fancy that film Brian: the uh ( 500 ms ) with the black cat ‘ The Green whatsit’ Alison: yeah, go at uh … ( looks at watch – 1.2 s ) … 20 to? Brian: sure Smallest unit is the utterance Turn taking  utterances usually alternate …

Adjacency pairs Simplest structure – adjacency pair Adjacency pairs may nest: Brian: Do you want some gateau? Alison: is it very fattening? Brian: yes, very Alison: and lots of chocolate? Brian: masses Alison: I'll have a big slice then. Structure is: B-x, A-y, B-y, A-z, B-z, A-x inner pairs often for clarification … but, try analysing the first transcript in detail!

Context in conversation Utterances are highly ambiguous We use context to disambiguate: Brian: ( points ) that post is leaning a bit Alison: that's the one you put in Two types of context: external context – reference to the environment e.g., Brian's ‘ that ’ – the thing pointed to internal context – reference to previous conversation e.g., Alison's ‘ that ’ – the last thing spoken of deictic reference

Referring to things – deixis Often contextual utterances involve indexicals: that , this , he , she , it these may be used for internal or external context Also descriptive phrases may be used: external: ‘ the corner post is leaning a bit’ internal: ‘ the post you mentioned’ In face-to-face conversation can point

Common Ground Resolving context depends on meaning  participants must share meaning so must have shared knowledge Conversation constantly negotiates meaning … a process called grounding : Alison: So, you turn right beside the river. Brian: past the pub. Alison: yeah … Each utterance is assumed to be: relevant – furthers the current topic helpful – comprehensible to listener

Focus and topic Context resolved relative to current dialogue focus Alison: Oh, look at your roses : : : Brian: mmm, but I've had trouble with greenfly. Alison: they're the symbol of the English summer. Brian: greenfly? Alison: no roses silly! Tracing topics is one way to analyse conversation. Alison begins – topic is roses Brian shifts topic to greenfly Alison misses shift in focus … breakdown

Breakdown Breakdown happens at all levels: topic, indexicals, gesture Breakdowns are frequent, but redundancy makes detection easy (Brian cannot interpret ‘ they're … summer’ ) people very good at repair (Brain and Alison quickly restore shared focus) Electronic media may lose some redundancy  breakdown more severe

Speech act theory A specific form of conversational analysis Utterances characterised by what they do … … they are acts e.g. ‘ I'm hungry’ propositional meaning – hunger intended effect – ‘ get me some food’ Basic conversational act the illocutionary point: promises, requests, declarations, … Speech acts need not be spoken e.g. silence often interpreted as acceptance …

Patterns of acts & Coordinator Generic patterns of acts can be identified Conversation for action (CfA) regarded as central Basis for groupware tool Coordinator structured email system users must fit within CfA structure not liked by users!

Conversations for action (CfA) Circles represent ‘states’ in the conversation Arcs represent utterances (speech acts)

CfA in action Simplest route 1–5: Alison: have you got the market survey on chocolate mousse? request Brian: sure promise Brian: there you are assert Alison: thanks declare More complex routes possible, e.g., 1–2–6–3 … Alison: have you got … request Brian: I've only got the summary figures counter Alison: that'll do accept

Text-based communication Most common media for asynchronous groupware exceptions: voice mail, answer-phones Familiar medium, similar to paper letters but, electronic text may act as speech substitute! Types of electronic text: discrete directed messages, no structure linear messages added (in temporal order) non-linear hypertext linkages spatial two dimensional arrangement In addition, linkages may exist to other artefacts

Problems with text No facial expression or body language  weak back channels So, difficult to convey: affective state – happy, sad, … illocutionary force – urgent, important, … Participants compensate: ‘flaming’ and smilies ;-) :-( :-)

example – ‘Conferencer’ linear conversation area – LHS RHS – spatial simulated pinboard

Pin board has similar granularity ‘ cards’ only appear on other participants’ screens when edit/creation is confirmed Note separate ‘composition box’ – transcript only updated when contribution ‘sent’ – granularity is the contribution Conferencer (ctd) Note separate ‘composition box’ – transcript only updated when contribution ‘sent’ – granularity is the contribution Pin board has similar granularity ‘ cards’ only appear on other participants’ screens when edit/creation is confirmed

Grounding constraints Establishing common ground depends on grounding constraints cotemporality – instant feedthrough simultaneity – speaking together sequence – utterances ordered Often weaker in text based communication e.g., loss of sequence in linear text

loss of sequence Network delays or coarse granularity  overlap 1. Bethan: how many should be in the group? 2. Rowena: maybe this could be one of the 4 strongest reasons 3. Rowena: please clarify what you mean 4. Bethan: I agree 5. Rowena: hang on 6. Rowena: Bethan what did you mean? Message pairs 1&2 and 3&4 composed simultaneously – lack of common experience Rowena: 2 1 3 4 5 6 Bethan: 1 2 4 3 5 6 N.B. breakdown of turn-taking due to poor back channels

Maintaining context Recall context was essential for disambiguation Text loses external context, hence deixis (but, linking to shared objects can help) 1. Alison: Brian's got some lovely roses 2. Brian: I'm afraid they're covered in greenfly 3. Clarise: I've seen them, they're beautiful Both (2) and (3) respond to (1) … but transcript suggests greenfly are beautiful!

Non-linear conversation hypertext-based or threaded-message systems maintain ‘parallel’ conversations 1. Alison: Brian’s got some lovely roses 2. Brian: I’m afraid they’re covered in greenfly 3. Clarise: I’ve seen them they’re beautiful 4. Clarise: have you tried companion planting?

Pace and granularity Pace of conversation – the rate of turn taking face-to-face – every few seconds telephone – half a minute email – hours or days face-to-face conversation is highly interactive initial utterance is vague feedback gives cues for comprehension lower pace  less feedback  less interactive

Coping strategies People are very clever! they create coping strategies when things are difficult Coping strategies for slow communication attempt to increase granularity: eagerness – looking ahead in the conversation game Brian: Like a cup of tea? Milk or lemon? multiplexing – several topics in one utterance Alison: No thanks. I love your roses.

The Conversation Game Conversation is like a game Linear text follows one path through it Participants choose the path by their utterances Hypertext can follow several paths at once

… like a game Brian: mmm, but I’ve had trouble with greenfly Alison’s turn Brian’s turn Alison: they’re the symbol of the English summer Alison: they’re the universal sign of love Brian: thanks, I’ll try that next year Brian: talking of love . . . Alison: have you tried companion planting? Brian: the red ones are my favourite Alison: Oh, look at your roses Alison’s turn Brian’s turn Alison: nice weather for the time of year participants choose the path by their utterances

Group dynamics Work groups constantly change: – in structure – in size Several groupware systems have explicit rôles But rôles depend on context and time e.g., M.D. down mine under authority of foreman and may not reflect duties e.g., subject of biography, author, but now writer Social structure may change: democratic, autocratic, … and group may fragment into sub-groups Groupware systems rarely achieve this flexibility Groups also change in composition  new members must be able to `catch up'

Physical environment Face-to-face working radically affected by layout of workplace e.g. meeting rooms: recessed terminals reduce visual impact inward facing to encourage eye contact different power positions

power positions traditional meeting room white board power positions at front in reach of white board

power positions augmented meeting room shared screen power positions at back – screen accessed by keyboard

Distributed cognition Traditional cognitive psychology in the head Distributed cognition suggests look to the world Thinking takes place in interaction with other people with the physical environment Implications for group work: importance of mediating representations group knowledge greater than sum of parts design focus on external representation

HCI 3e - Ch 14: Communication and collaboration models

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HCI 3e - Ch 14: Communication and collaboration models