Despite the increasing research on workgroup diversity, diversity itself remains an ambivalent term due to the various and in some cases even conflicting ways in which scholars conceptualize its nature (Janssens and Zanoni, 2005). An examination of the relevant literature illustrates four main streams in diversity research. A first stream of research views A doctoral study is a long journey and completes with the invaluable support and contribution of several people. I wish to express my sincere gratitude to everyone who made feasible the completion of this journey.I wish to thank my supervisor, Dr. Marianthi Stogiannidou, for her guidance, moral and practical support during the last two years of the preparation of this thesis. Her confidence in me was a key motivator during times of uncertainty. I am also indebted to Dr. Leonidas Maroudas, my supervisor during the first four years (and current member of my advisory committee) for his valuable guidance, support, encouragement, and constant interest during the whole research journey. I wish to sincerely thank Dr. Olivia Kyriakidou, member of my advisory committee, for her inspiration, valuable guidance, insightful comments and suggestions. She influenced me in many ways and I'm grateful to her. I gratefully acknowledge the 3-year scholarship from the Department of Business Administration of the University of the Aegean. I wish to thank the administrative and academic staff in the postgraduate studies (MBA) and the Department of Business Administration for their assistance and support at various stages. I wish to particularly thank Mrs. Vasso Vasileiou for making me feel more than home during my stay in Chios. I am sincerely grateful for her moral and practical support throughout the whole PhD journey, and I could never thank her enough. I am also indebted to Dr. Michalis Bekiaris for his advices, moral and practical support through my journey; his support was valuable. I am also particularly appreciative of Dr. Nikolaos Konstantopoulos, Dr. Mania Mauri, and Dr. Eleni Gaki for their constant encouragement during my stay in Chios. I also wish to thank Dr. Theodoros Iosifides in the Department of Geography (Mytilene) for his expertise, time, and advices regarding qualitative methodology.I would especially like to thank all the group members who participated in the research. I appreciate your enthusiasm for my study and your willingness to allow me access to your project group. This study would not have been possible without you.I wish to sincerely thank Maria Andri, my critical research companion, who has been a constant source of motivation to me through the good and bad times that are part of a PhD. I am also grateful to Sofoklis Skoultsos, Michalis Geranios and the rest of my colleagues at the v Department of Business Administration in Chios who supported and encouraged me during the PhD journey. I am particular grateful to Konstantina Tsiakali for her willingness, her time and effort to help me find an EU-funded project group for my case study. I also wish to sin...