Software history under the lens: A study on why and how developers examine it. In ICSME 2015, pages 1–10, 2015. “Software history is indispensable for developers. Of the 217 developers surveyed in this work, 85% find software history important to their development activities and 61% need to refer to history at least several times a day.” More benefits: Knowledge acquisition (Pham et al., 2013) End-users take advantage of the software history (Kuttal et al., 2014) Research (co-changes, defect prediction, mining, etc.)