Understanding the impact of change on an organization requires measuring various aspects of the organizational climate or environment. In a study at a psychiwric hospital in Maine, the authors developed a model for measuring organizational climate after the introduction of a geographical unit system brought a major change in the hospital's structiue. Through questionnaires and interviews, they examined staff attitudes toward nine factors that are generally accepted as determinants. of organizational climate. Areas studied included gaps in role perception between workers and supervisors, relationships among members and leaders of ward teams, motivational factors, and staff perceptions of the impact of change.