tl;dr:"I have been collecting random software engineering research ideas from friends and colleagues for more than a decade. These are the questions I’ve been asked since I started taking notes ten years ago," including: (1) Does putting documentation in code actually work better than keeping the documentation in separate files, and if so, by what measure(s)? (2) Do doctest-style tests have any impact long-term usability or maintainability compared to putting tests in separate files? And more
tl;dr:"I've looked back at the end of every software project I've ever been on and thought, "If I'd known then what I know now, I'd have been done in half the time." A study followed eight projects, each over two and a half years and categorized the waste seen in development e.g. building the wrong feature or product, mismanaging backlog, and the causes for each type of waste.