Causal research, also known as explanatory research is conducted in order to identify the extent and nature of cause-and-effect relationships. First measuring the significance of the effect, like quantifying the percentage increase in accidents that can be contributed by road rage. Causal research can be defined as a research method that is used to determine the cause and effect relationship between two variables. In the online survey world, mastery of all three can lead to sounder insights and greater quality information. Causal research can be conducted in order to assess impacts of specific changes on existing norms, various processes etc. Posted by FluidSurveys Team June 3, 2014 Categories: Survey Design, Research Design, Best Practices. Most research can be divided into three different categories; exploratory, descriptive and causal.Each serves a different end purpose and can only be used in certain ways.