This document summarizes research on the impact of career models on teacher motivation. It discusses problems with single salary structures for teachers and explores Herzberg's dual factor theory of motivation. Research suggests pay alone does not increase motivation in developed countries, but is more important in developing countries where basic needs are not met. The document also analyzes intrinsic and extrinsic motivation and reviews career ladder programs in Arizona, Missouri, and Portugal that link pay to performance. Key lessons are that teacher evaluation should use multiple valid sources, standards should provide clarity on promotions, responsibilities should not be too demanding, and career ladders work best when criterion-referenced rather than competitive.