my research topic is "a comparative analysis of heavyweight and agile methodologies in software industry of pakistan". it is related to software project management and computer sciences fields. which theory/theories guide this research?
Your research on: "a comparative analysis of heavyweight and agile methodologies in software industry of pakistan" is interesting and relevant not only in Pakistan but worldwide In your research you need to establish a proper application scenario related to computer science with proper research methodologies. You may find my PhD seminar helpful: Presentation PhD Thesis Research Communication Seminar
What are your basic assumptions regarding comparative analysis of heavyweight and agile methodologies? That matters a lot. A number of models/theories/ paradigms underlying software systems development have been discussed in past research. You may read papers published in 1990 entitled " Theories of comparative analysis by Weld, D. S.", and
Nayan,N.M. (2009 ) Information System Development Model: Theories Analysis and Guideline , International Visual Informatics Conference . May be you find these papers relevant.