“…object of study [1], population/sample [3], [10], threats to validity [13], data collection [15], measurements/metrics [11], and data analysis [10], [13]. Overall, six publications [2], [3], [6], [10], [12], [13] explicitly state that the use of empirical research in RE and SE is constantly increasing. This increase is accompanied by the need to have a comprehensive, up-to-date, and long-term available overview of the state and evolution of empirical research [1], [5], [6].…”