Some sources list a second edition.
It never existed. This book is for anyone who wants to understand the key concepts of object-oriented programming whether manager or professional programmer or planner or professional in another field, or just the curious. Concepts are illustrated with short programs written in the Smalltalk language. Smalltalk, being completely object-oriented and unfamiliar to most readers, thus not bringing expectations from prior exposure, is a good learning vehicle. Along the way you'll learn the basics of Smalltalk.