The hardest part of research is working out what the question is. These movies show how to reduce an open question into several logically-consistent closed questions and then how to answer these with rigorous research.
When you encounter a problem for the first time, or need a fresh start, try using an issue tree
An issue tree is used to divide a large open question into a series of smaller questions that can be answered by rigorous analysis. This movie shows how to create an issue tree, using a simple example. Credit: Matthew Juniper