This volume contains the proceedings of the 12th International Workshop on Variability Modelling of Software-intensive Systems (VaMoS 2018), which was hosted at the Rey Juan Carlos University (URJC) in Madrid, Spain, during February 7-9, 2018. The eleven previous editions were held in Eindhoven (2017), Salvador (2016), Hildesheim (2015), Nice (2014), Pisa (2013), Leipzig (2012), Namur (2011), Linz (2010), Sevilla (2009), Essen (2008), and Limerick (2007). |