Self-Consistency Theory was developed by Prescott Lecky in the 1920s and focuses on the importance of the self in the regulation of thoughts and ideas. The basis of this theory proposes that people use self helping measures to maintain constancy (or consistency) of ideas within an individual. Consistency of ideas and representation of the self are integral in humans. People need a "master motive" that organizes and maintains consistency in their ideas and behavior. A person can function normally due to the regulation of their self-concept and maintaining constancy within their mental functions.