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This chapter complements the chapters on technical reviews and software reliability engineering in Vol. 1 of the handbook. It is primarily concerned with the verification of code by means of testing, but an example of an informal proof of a program is also given. A practitioner's view of testing is taken throughout, including an overview of how testing is done at Microsoft.
The concept of Visual Routine is introduced. A. description is given of an implemented computer system which can correctly compute in images of simple 2-D geometric shapes eleven common properties and relations. A visual routine programming language is outlined. Issues relevant to the control of visual-routine-based search are discussed. The results of testing the system are reported…