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Simulation studies in the context of Robert Axelrod's research on iterative prisoner's dilemma games focus nearly exclusively on the two-player-version of the game. In contrast, this article reports results of a simulation with an iterated N-prisoners' dilemma where group size N varies between 2 and 30. The simulation investigates the relative performance of conditional cooperative strategies with increasing group size. Results show that some 'nice' strategies like 'tit-for-tat' are relatively successful and robust even in larger groups and non-nice environments. However, this does not solve the cooperation problem. On the contrary, the relative success of some 'nice' conditional cooperative strategies is paralleled by a rapid decline of cooperation in large groups.

Cover -- Half Title -- Title Page -- Copyright Page -- Contents -- Preface -- Chapter 1. Introduction: Metamorphosis in the Making -- The Nature of Computerized Hyperstructures -- The New Industrial Revolution -- Computers Transform the Factory -- Computerized Military Weaponry -- The Transformation of Telecommunications -- Transportation -- And Communications Sectors -- Education -- Medicine and Health Care -- The Sciences -- The Transformation of theNatural Resource Industries -- The Financial Services Sector -- Black Monday -- The Future: Coping witha Computer-Mediated Society -- Societal Revolutions in Perspective -- The Smithian, Marxian, and SchumpeterianVisions of Societal Evolution -- The Computer, Capitalism, andthe Evolution of Society -- Chapter 2. The Rise of the Computer-Based Information Infrastructure -- Information: The Raw Material of Corporate,Economic, and Political Decision Making -- A Brief History of Databank Developments -- The Personal Computer, the Telephone,and the Databank Industry -- Electronic Information in Its Own Right -- High-Capacity Storage,Processing, and Delivery -- The New Electronic FinancialInformation Services Game -- Reuters Diversifies -- Dun & Bradstreet Evolves -- McGraw-Hill Expands -- The Evolving Computer-MediatedGlobal Information Infrastructure -- Chapter3. Computerizing the Money and Payments -- The Money Economy Goes Electronic -- ATMs, POS Systems, and Bank Cards -- The Growth of Magnetic Strip Cards -- The Age of ATM Networks -- Shared ATM Networks for Banks and Retailers -- A Wired Up America -- Competition Heats Up in theCredit Card Business -- Universal, Multipurpose Retail Machines -- Intelligent Plastic -- The Computer Creates a National andGlobal Financial Village -- The Invisible World ofArtificially Intelligent Money

This study investigated the effects of manipulating design features of a computer-mediated text (CMT) system on the reading and writing performance of 45 hearing-impaired students. Five versions of a CMT system with an electronic dictionary (ED) were utilized. Versions included either an intrinsic motivation activity (vocabulary game), an extrinsic motivation activity (post-passage test), or no motivation activity. In addition, the kind of information obtained from the ED was varied. Some versions displayed a stand-alone definition; others displayed the definition with a sentence using the word in context. Results showed the extrinsic motivation activity related to better reading and writing performance by student users. An on-line record of student access to the ED was kept, and analysis indicated greater access was related to better post-treatment vocabulary knowledge. Implications of the findings are discussed with respect to the design of computer-based learning environments for hearing-impaired students.