The document discusses different ways to classify research based on data type, purpose, and method. Research can be classified as either quantitative or qualitative based on whether it uses numerical data that can be measured or qualitative data such as opinions. Quantitative research aims to quantify data while qualitative research provides descriptive details. Research can also be classified as fundamental, applied, or action-oriented based on its purpose. The methods used to conduct research can include historical, philosophical, experimental, or descriptive survey approaches.