A detailed description of the Staff Sentiment Scale (SSS) is given. In addition, a brief description of the Conceptual Model, upon which the SSS is based, is given. The model is based on an extensive review of the literature of organizational theory and differentiated staffing and upon systematic observations in schools. It treats Process Variables, Product Variables and five categories of Essential Characteristics. Three of these categories form the basis of the present instrument. The SSS attempts to quantify Individualism, Collegiality, and Professional Disposition. Individualism represents the self-image of the individual and his identification with the organization. Forty-two items were selected for this categpry. Collegiality focuses on interpersonal relations among individuals in the organization. Twenty-three items were selected for this category. Professional Disposition reflects commitments to the students to an area of expertise, and to the public trust. Twenty-one items were selected for this category. An item sampling procedure was used to obtain contingent product-moment correlations within and between nine subscales. Revision of the SSS was based upon item analysis, subscale intercorrelations, and the need to bring the administration time down to the practical limits of a class period. Five subscales resulted: self-concept, frequency of interaction, collegiality, professional practices of school, preferred professional practices. Results of unidimensional analysis show that self-concept is the highest valued. Results of factor analysis show the highest loading to be on self concept. (CK)