Implementation of Information Technology infer substantial changes to an organisation, e.g. changes in jobs, roles of the company's employees, and the knowledge content of these jobs.This paper point out some of the knowledge management issues and challenges in the case of an implementation of an information system that continuously keeps track of the current state of the product as a basis for controlling the production process (i.e. the CALS system). In addition, considerations regarding operating the CALS system in a working situation are presented with regard to the input and control decisions performed by humans. Their decisions are based on the integration of three different kinds of knowledge, i.e. uncodifiable or tacit knowledge, codifiable data from acquisition systems, and codifiable best practice from knowledge repositories.