[PICMET - Portland State Univ PICMET'01. Portland International Conference on Management of Engineering and Technology. Proceedings Vol-1: Book of Summaries - Portland, OR, USA (29 July-2 Aug. 2001)] PICMET '01. Portland International Conference on Management of Engineering and Technology. Proceedings Vol.1: Book of Summaries (IEEE Cat. No.01CH37199) - An analysis and comparison of different types of electronic payment systems