Due to the time-consuming nature of code reviews, researchers investigated their benefits and influencing factors [7,36,50]. While a variety of studies focused on inspections, research on MCR is in the early stages. Only two studies analysed the outcome of MCR: (1) Bacchelli and Bird investigated motivations and outcomes of MCR at Microsoft [5], and (2) Mäntylä and Lassenius classified the types of defects found in review on university and three industrial software systems [32].