This book includes a selection of papers presented at the Third World Conference on Qualitative Research (WCQR2018), held in Lisbon, Portugal on October 17–19, 2018. The WCQR2018 focused on four main fields of application (Education, Health, Social Sciences, and Engineering and Technology) and seven main subjects: Rationale and Paradigms of Qualitative Research; Systematization of Approaches with Qualitative Studies; Qualitative and Mixed Methods Research; Data Analysis Types; Innovative Processes of Qualitative Data Analysis; Qualitative Research in Web Contexts; and Qualitative Analysis with the Support of Specific Software. Given its breadth of coverage, the book offers a valuable resource for academics, researchers, teachers and students seeking information on the above topics, and on the use of Computer Assisted Qualitative Data Analysis (CAQDAS).