Research in organizational development and ecological psychology has demonstrated the importance of viewing organizations from a systems perspective. Organizational innovations are planned, designed, and implemented in increasingly complex and dynamic ecosystems. This paper presents a model of organizational change which was developed using a general change systems approach and in which the consultant plays a key role. The model is presented as an applied working model designed to provide consultants and consultees with a conceptual view of a system definition, an assessment tool for determining what information to gather, and a procedural guide for viewing and influencing ongoing change interventions. The four primary components of an organizational system, i.e., goals, framework, methods, and the psychosocial, are identified and defined. A graphic representation of the model is included. (JAC)