History RCoSE 2018 is the 4th instance of the workshop series. Previous workshops have been held: 3rd RCoSE Workshop 2017 at ICSE 2017 in Buenos Aires, Argentina. CSED Workshop 2016 at ICSE 2016 in Austin, USA. 2nd RCoSE Workshop 2015 at ICSE 2015 in Florence, Italy. 1st RCoSE Workshop 2014 at ICSE 2014 in Hyderabad, India.