Design Principles Behind Smalltalk (1981)
Hmm.  &quot;Languages and systems that are of sound design will persist, to be supplanted only by better ones.&quot;  I wonder if the author still thinks that, looking at the programming language landscape today.  (Either he would have to say &quot;it didn&#x27;t work out that way&quot;, or to say that C++ and Java were better than Smalltalk.)