Proceedings of the REFSQ 2013 Workshops CreaRE, IWSPM, and RePriCo, the REFSQ 2013 Empirical Track (Empirical Live Experiment and Empirical Research Fair), the REFSQ 2013 Doctoral Symposium, and the REFSQ 2013 Poster Session : 19th International Working Conference on Requirements Engineering: Foundation for Software Quality (REFSQ 2013) ; Essen, [April 8 - 11, 2013] (2013)