According to William Glasser’s reality therapy, human behavior is primarily influenced by:

William Glasser's reality therapy emphasizes that human behavior is largely influenced by a person's internal desires and needs, rather than external factors. This approach posits that individuals are motivated by a desire for personal choice and the satisfaction of basic human needs, such as love, power, freedom, and fun, which originate from within themselves.

Reality therapy focuses on helping individuals take responsibility for their choices and actions, encouraging them to reflect on how well their current behaviors are meeting their needs. This internal locus of control means that individuals have the power to effect change in their lives by altering their thought processes and behaviors based on their own values and goals.

By prioritizing personal agency over external influences, Glasser's theory presents a framework for understanding how individuals can achieve greater satisfaction in their lives through self-awareness and choice, making the premise that control originates from within the individual a fundamental concept of reality therapy.