This document discusses different types of research classification. It covers three types of classification: by purpose, by strategy, and a comparison of quantitative and qualitative methods. For classification by purpose, there are three main types: basic research which seeks new knowledge, applied research which aims to solve practical problems, and action research which examines solutions through a systematic process. For classification by strategy, research can be quantitative which uses statistical analysis or qualitative which uses interpretive methods. Both have different characteristics and designs. The document compares the nature, assumptions, and strengths of quantitative and qualitative approaches.