Experiments are central in the software engineering PhD studies at Lund University – the classic textbook by Wohlin et al. was written there. I follow there definition: “Experiment (or controlled experiment) in software engineering is an empirical enquiry that manipulates one factor or variable of the studied setting. Based in randomization, different treatments are applied to or by different subjects, while keeping other variables constant, and measuring the effects on outcome variables. In human-oriented experiments, humans apply different treatments to objects, while in technology-oriented experiments, different technical treatments are applied to different objects” (Wohlin et al. 2012).