Abstract
The traditional paradigm of information processing in the managerial organization theory has acknowledged the organization as "an aggregation of individual who makes a decision". Activities of the organization have been managed through controlling members with disciplines and orders. The design of matrix organization by Galbraith also follows this paradigm. In this study the author classified the information processing activities in the matrix organization of Japan Sewage Works Agency into 16 categories and investigated. As a result of the cross analysis and the interviews, it was proved that the Japan Sewage Works Agency have changed the official communication channels in order to adapt the change in the organizational environment. The author will discuss the fact that they acknowledged the organization as "an aggregation of the member's communication" and they have managed the project effectively through the change of the communication channels.
