Cognitive Evaluation Theory (CET- Deci 1975) is a theory in Psychology

Psychology

Psychology is the study of the mind and behavior. Its immediate goal is to understand individuals and groups by both establishing general principles and researching specific cases. For many, the ultimate goal of psychology is to benefit society...

 that is designed to explain the effects of external consequences on internal motivation

Motivation

Motivation is the driving force by which humans achieve their goals. Motivation is said to be intrinsic or extrinsic. The term is generally used for humans but it can also be used to describe the causes for animal behavior as well. This article refers to human motivation...

. Specifically, CET is a sub-theory of Self-Determination Theory

Self-Determination Theory

Self-determination theory is a macro theory of human motivation and personality, concerning people's inherent growth tendencies and their innate psychological needs. It is concerned with the motivation behind the choices that people make without any external influence and interference...

 that focus on competence

Competence

Competence may refer to:*Competence , the ability of a cell to take up DNA*Competence , the resistance of a rock against either erosion or deformation...

 and autonomy

Autonomy

Autonomy is a concept found in moral, political and bioethical philosophy. Within these contexts, it is the capacity of a rational individual to make an informed, un-coerced decision...

 while examining how intrinsic motivation

Motivation

Motivation is the driving force by which humans achieve their goals. Motivation is said to be intrinsic or extrinsic. The term is generally used for humans but it can also be used to describe the causes for animal behavior as well. This article refers to human motivation...

 is affected by external forces.

CET uses three propositions to explain how consequences affect internal motivation:

1. External events will impact intrinsic motivation for optimally challenging activities to the extent that they influence perceived competence, within the context of self-determination
   Self-determination
   Self-determination is the principle in international law that nations have the right to freely choose their sovereignty and international political status with no external compulsion or external interference...
   
   .