Program comprehension (also program understanding or [source] code comprehension) is a domain of computer science concerned with the ways software engineers maintain existing source code. The cognitive and other processes involved are identified and studied. The results are used to develop tools and training.

Software maintenance tasks have five categories: adaptive maintenance, corrective maintenance, perfective maintenance, code reuse, and code leverage.

Titles of works on program comprehension include

Computer scientists pioneering program comprehension include Ruven Brooks, Ted J. Biggerstaff, and Anneliese von Mayrhauser.