"Preface Network Sampling was possibly invented by Sirken (1970, 1983) while Chaudhuri & Stenger (2005) briefly narrated his theory; and J.N.K. Rao (1999) further elaborated about this subject as introduced by Sirken. Chaudhuri's (2000) exposition on it thrives on the foundation laid by Thompson (1990,1992) and Thompson & Seber (1996) on 'Network Sampling', named by the latter two researchers. "Adaptive Sampling" too, from what is understood, originated through the researches made by Thompson (1990, 1992) while Thompson & Seber (1996) and further strengthened by Chaudhuri (2000). Salehi & Seber (2002) and Seber & Salehi (2013) have also contributed immensely to the subject. First, let us shed some light on the subject. In a standard household survey our intention may be to serviceably estimate the population total or mean of a variable which is an important consideration but is valued zero for many households while it is substantial for many others. However, before conducting the survey viii Network and Adpative Sampling"--