In this paper, the writer discusses the philosophical underpinnings of the two dominant research methods in social sciences; quantitative and qualitative paradigms. The natures of two paradigms are quite different so this leads many researchers to discuss these issues in a comparative way. This paper tackles the knowledge and understanding of quantitative and qualitative paradigms, their nature, advantages, disadvantages, assumptions, criticisms, and the possibility of linking two paradigms. Issues of validity, reliability, objectivity, and generalisation are also investigated from two distinctive perspectives of paradigms. Finally, the conclusion and suggestions are given at the end of the paper. The novice researchers who are in dilemmas about making decisions about their research designs would potentially find the discussions useful.