Beliefs can be categorized into various types depending on their ontological status, their degree, their object or their semantic properties.
Adherents of particular religions deal with the differing doctrines and practices espoused by other religions or by other religious denominations in a variety of ways.
Strategic approaches make a distinction between rules, norms and beliefs as follows:
An extensive amount of scientific research and philosophical discussion exists around the modification of beliefs, which is commonly referred to as belief revision. Generally speaking, the process of belief revision entails the believer weighing the set of truths and/or evidence, and the dominance of a set of truths or evidence on an alternative to a held belief can lead to revision. One process of belief revision is Bayesian updating and is often referenced for its mathematical basis and conceptual simplicity. However, such a process may not be representative for individuals whose beliefs are not easily characterized as probabilistic.
Psychologists study belief formation and the relationship between beliefs and actions. Three types of models of belief formation and change have been proposed: conditional inference process models, linear models and information processing models.