Steps of the Scientific Method - The scientific method has a similar structure to an hourglass - starting from general questions, narrowing down to focus on one specific aspect, then designing research where we can observe and analyze this aspect.
At last, the hourglass widens and the researcher concludes and generalizes the findings to the real world.
There is no straight answer to the best reasoning to apply to the research process. Here are a few articles about different reasoning and logic when conducting the scientific method.
Experiment Resources (2008). Research Process. Retrieved [Date of Retrieval] from Experiment Resources: http://www.experiment-resources.com/research-methodology.html