In searching for good activities to fill up my daughters’ summer days, I returned to one of my old favorite, Mindstorms by Seymour Papert. It is a book worth spending quality time to go through multiple times. The central theme of the book is about learning and thinking, about how computer could help children acquire models to think with and to build their own intellectual structures. One of Papert’s big ideas is about debugging, especially debugging our intuition. Papert had great examples and analysis on that in the book.Papert is right that not many of us could get anything exactly right the first time. It is very important for us to cultivate the debugging skill and not get intimated. Papert think we can debug almost anything, concepts, mental and physical skills, our intuitions, problem settings, project works, to name a few. The most important step of the debugging process is to externalize what we want to debug and put it in a form or procedure that we can name, manipulate, critique and talk about, to break down and isolate parts to test, and to change.