This article presents a model of the implementation process for dedicated packages and describes a research project to test the model undertaken with the cooperation of a major computer vendor. Data were collected from 78 individuals in 18 firms using the package and from the package vendor. The results of the study offer some support for the model, along with suggestions for package implementation for both the customer and package vendor. The purpose of this article is to describe a study of the implementation process for a packaged system, called Production System (PS). A major computer vendor designed and programmed PS and offers it to its customers. PS consists of multiple, integrated modules, with each module dedicated to a different aspect of the manufacturing process. Customers can order all or parts of the package for installation on the vendor's computers.