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The OSI-3 is a direct derivative from the OSI-1. Psychometric investigation suggested that the OSI-1 could be shortened and that the Work Environment scale provided such useful data that it should be given more weighting in the scoring and interpretation of the OSI.

Note: First time users are strongly recommended to purchase the Specimen Set initially. This is the way to obtain the most comprehensive set of materials to get started. Subsequently you will only need to order Question Booklets and Profile Sheets. This is also more economical than buying components separately.

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