The book The Common Lisp Condition System is his first work -- an attempt to create a tutorial on the condition system that was missing, even all the years after which ANSI Common Lisp was standardized.
The flow should be like "a tutorial (...) that was missing" - there wasn't a tutorial on the Common Lisp condition system.
The flow should be like "a tutorial (...) that was missing" - there wasn't a tutorial on the Common Lisp condition system.