The invention relates to a system and method for identifying occurrences of preventive maintenance on computer source code. The method comprises analyzing source code, defining data sets associated with characteristics of the source code, and applying an operation algorithm to the data sets to thereby identify occurrences of preventive maintenance operations that were carried out on the source code. A first instance of a source code and a second instance of the source code are preferably analyzed, wherein the second instance of the source code is a revised version of the first instance of the source code, a first data set associated with the first instance of the source code and a second data set associated with the second instance of the source code are preferably defined, and the operation algorithm is preferably applied to the first data set and the second data set to thereby identify at least one occurrence of a preventive maintenance operation that was carried out on the source code.