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Thirty-one years ago, the ACM Computing Curricula used the terms "CS1" and "CS2" to designate the first two two courses in the introductory sequence of a computer science major. While computer science education has greatly changed since that time, we still refer to introduction to programming courses as CS1 and basic data structures courses as CS2. This common shorthand is then used to enable students to transfer between institutions and as a base of many research studies.
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