The paper “Notation as a Tool of Thought” by Kenneth E. Iverson of the IBM Thomas J. Watson Research Center was published in the *Communications of the ACM*, Volume 23, Number 8, 1980-08. It’s available online at https://www.jsoftware.com/papers/tot.htm. Thanks to John Arundel (https://twitter.com/bitfield) who called attention to the paper in a tweet.

The paper deals with the way an appropriate notation influences people’s thinking in a given domain. Iverson was interested in the domain of mathematical computing, and he uses the APL language to illustrate his ideas. APL is an array-processing language Iverson developed in the 1960s. It has a following even today. You can read more about it on the APL Wiki at https://www.aplwiki.com/. You can try it out online here: https://tryapl.org/,

In this piece, I’m going to stretch the point a bit and apply some of the principles of notation Iverson presents in his article to a different domain: unit testing of application software.

Continue reading Notation and Thought in Unit Testing