This book was a mix of memory lane, tips and essays from others.
The preface explains that this is a small book because it solves a small problem. The author reminisces about the the Snowbird meeting and the start tho the agile manifesto. He talks about 4 agile frameworks. (It's been a while since I thought about XP).
I like that he asks you to count the number of computers in your life. (Did you remember to count things like your clock and DVR). It was fun hearing the origin of the term “checkout” for source code. (from checking out physical punch cards from the drawer).
There are many good examples and stories throughout. I liked “Who is training the new people? The people who made the mess in the first place”. The point that the outer circle of Scrum is a “highly efficient way to make a large mess.”
The last two chapters were essays written by others, but they fit well. We are currently on lockdown due to coronavirus, but I look forward to passing this book around when I see people again!