Agile Methods 9th Brazilian Workshop, WBMA 2018, Campinas, Brazil, October 4, 2018, Revised Selected Papers - Tonin, Graziela Simone; Tonin, Graziela Simone; Estácio, Bernardo; Estácio, Bernardo; Goldman, Alfredo; Goldman, Alfredo; Guerra, Eduardo; Guerra, Eduardo (Springer International Publishing : Imprint: Springer, 2019)