Might be somewhat tangential, but I found this book extremely helpful: The Secrets of Consulting : Gerald Weinberg https://www.goodreads.com/en/book/show/5662

Might be somewhat tangential, but I found this book extremely helpful: The Secrets of Consulting : Gerald Weinberg https://www.goodreads.com/en/book/show/566213 https://www.goodreads.com/en/book/show/566213