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To purchase or authenticate to the full-text of this article, please visit this link: http://dx.doi.org/10.1111/j.1467-6451.2008.00365.x Byline: CARLO CAMBINI ([dagger]), TOMMASO M. VALLETTI ([double dagger]) Keywords: L41; L96 Abstract: We develop a model of information exchange between calling parties. We characterize the equilibrium when two interconnected networks compete by charging both for outgoing and incoming calls. We show that networks have reduced incentives to use off-net price discrimination to induce a connectivity breakdown when calls originated and received are complements in the information exchange. This breakdown disappears if operators are allowed to negotiate reciprocal access charges. We also study the relationship between sending and receiving retail charges as a function of the level of access charges. We identify circumstances where private negotiations over access charges induce first-best retail prices. Author Affiliation: ([dagger])Politecnico di Torino, DSPEA, C.so Duca degli Abruzzi, 24, 10139 Turin, Italy.e-mail:carlo.cambini@polito.it ([double dagger])Imperial College London, University of Rome 'Tor Vergata' and CEPR, Business School, South Kensington Campus, London SW7 2AZ, U.K.e-mail:t.valletti@imperial.ac.uk

Study of internal organizational change, for planning redesign of computer networks, is presented. Effects of technology position and planning mode of organization on process of change are discussed.

Identification of media space, media class, media object, media instance and media experience as units of analysis helps in perceiving the essential differences between the Internet and other communication technologies. Researchers, in an effort to analyze human communication on computer and network systems, have examined different communication settings. The units of analysis and consistent terminology enable Internet communication researchers to define several research settings. Identification of units of analysis paves way for theoretical integration and cross study comparisons.

Research identifying important differences between perceived and observed communication networks has created the need for an integrative model to link th two phenomena. The theory described here proposes that observable communication is the result of a latent network of perceived communication relationships that is instantiated when activity foci are triggered. Giddens' (1984) structuration theory, Homans' (1950) theory of the human group, Feld's (1981) model of activity loci, and the concept of triggering events are incorporated to define activity, make it conceptually distinct from interaction, and explain how it acts to instantiate perceived communication relationships. Three modalities of enactment, activation, and reticulation are advanced as explanations for the production of observable communication. The falsifiability of the theory is established via a comparison of algebraic models, and three key research issues stemming from the theory are addressed.