This thesis aimed to develop a measure to investigate the perceived motivational climate in individual sports. In particular, it aimed to address some of the knowledge gaps in the current literature examining motivational climates: by developing a measure whose intended population participate in individual sports; that incorporates the perceived motivational climate created by multiple significant others; and that incorporates the 'impact' or salience of each of these perceptions of the motivational climate. In order to achieve this, the thesis is comprised of four studies.