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Context: software projects are common resources in Software Engineeringexperiments, although these are often selected without following a specificstrategy, which reduces the representativeness and replication of the results.An option is the use of preserved collections of software projects, but thesemust be current, with explicit guidelines that guarantee their updating over along period of time. Goal: to carry out a systematic secondary study about thestrategies to select software projects in empirical studies to discover theguidelines taken into account, the degree of use of project collections, themeta-data extracted and the subsequent statistical analysis conducted. Method:A systematic mapping study to identify studies published from January 2013 toDecember 2020. Results: 122 studies were identified, of which the 72% usedtheir own guidelines for project selection and the 27% used existent projectcollections. Likewise, there was no evidence of a standardized framework forthe project selection process, nor the application of statistical methods thatrelates with the sample collection strategy.

A Systematic Mapping Study of Empirical Studies performed with Collections of Software Projects