The research subject is the development of information science in Croatia. Bibliometric analysis was done on the corpus of 170 PhD theses done at Croatian universities. The results of the research are presented in two parts: I Bibliometric analysis of the PhD theses in information sciences from 1978-2009, II Methodology of research and/or the research of methodology. The first part examines the development of information sciences studies; the scope of analyzed corpus; quantitative overview of the data; the analysis of citations, co-citations, and co-words. The second part deals with the study of methodology and the discussion about the difference between impact and influence factor; scientific communication and cognitive patterns are analyzed; usefulness and value of bibliometric methods are analyzed by comparison of the author’s citation, co-citation and co-words findings on the same corpus of data; terms cohesion and coherence are advocated as the measure of scientific cooperation and communication. The use of bibliometric methods for the identification of four different types of networks is proposed: social, institutional, communicational and cognitive networks.