This book constitutes the refereed proceedings of the 15th International Conference on Electronic Commerce, ICEC 2013, held in Turku, Finland, in August 2013. The theme of ICEC 2013 was "effective, agile, and trusted e-services co-creation" and reflects the alignment between computerized, formalized business procedures with the need to flexibly adapt and innovate businesses on the spot according to changing customer needs and requirements. The 13 papers published in this book were carefully reviewed and selected from more than 50 submissions, resulting in an acceptance rate of less than 25%. They are organized in topical sections on online advertisements and referential systems, recommender systems and pricing, social media, mobile services, business models, and societal implications.

13E 2006, the 6th in this series of IFIP conferences, marked the congregation of researchers and practitioners in the areas of e-Commerce, e-Business, and e-Government. The conference was sponsored by IFIP TC 6 in cooperation with TC 8 and TC 11.

The conference provided a forum for researchers, engineers and interested users in academia, industry, and government to discuss the latest research, cutting-edge practice and upcoming trends in the growing areas of e-Commerce, e-Business, and particularly e-Government. Sophisticated applications as well as the underlying technology that supports such applications were discussed and demonstrated. The conference attracted a wide range of participants representing a significant community of researchers and practitioners from a broad range of countries.

The conference was organized along parallel tracks, each track focusing on specific aspects of current research, industry applications, and public administration.

13E 2006, the 6th in this series of IFIP conferences, marked the congregation of researchers and practitioners in the areas of e-Commerce, e-Business, and e-Government. The conference was sponsored by IFIP TC 6 in cooperation with TC 8 and TC 11.

The conference provided a forum for researchers, engineers and interested users in academia, industry, and government to discuss the latest research, cutting-edge practice and upcoming trends in the growing areas of e-Commerce, e-Business, and particularly e-Government. Sophisticated applications as well as the underlying technology that supports such applications were discussed and demonstrated. The conference attracted a wide range of participants representing a significant community of researchers and practitioners from a broad range of countries.

The conference was organized along parallel tracks, each track focusing on specific aspects of current research, industry applications, and public administration.