 This is a system that drew from John McCarthy's language LISP and from simulation programming language Simula, versions 1 and 67, which were developed by the Norwegian Computing Center.In Kay's account of Smalltalk's early development, he cited key milestones attributed to Kaehler.According to Kay, along with Ingalls, Dave Robson, and Diana Merry, for instance, Kaehler successfully implemented the Smalltalk-76 system from scratch within a period of seven months.