This is a nice book about how to unlock assumptions to dig deeper for underlying questions for a particular topic. Chapter 3 really boils down to learning to ask the right questions about a topic. Asking questions and inquiring about events can lead to further research if these same questions are not already research in itself. Chapter 4 focuses on transforming questions into problems or hypotheses. The book references a topic->question->significance model to help unlock problems of significance to a field. Page 67 references a beginners mistake to tackle a problem which is too large. Instead, it is recommended to understanding key components to the bigger problem and perhaps work on significant problems related with the key components. The book author notes that it is perfectly acceptable to disagree or question assumptions made by other research sources. Chapter 5 focuses on how to find data or sources related to research problems. The author notes the three tiers of traditional research: primary sources, secondary sources, and tertiary sources. Primary sources are directly witnessed. Secondary sources are research reports which cite primary sources. And, tertiary sources are books articles written about secondary sources. The author recommends some ways to test the validity of the source including place of publication, peer review, author, and timing. The author notes (p. 78) that even well respected medical journals have found that there are errors made even when the articles are peer reviewed. Finally, the chapter ends with venues where sources can be found.
The book has a nice flow and organization. One new technique to find sources was developed by Google last year. Their new search tool helps users find data: https://toolbox.google.com/datasetsearch. Another useful read is "Talking to Humans" https://www.talkingtohumans.com/