What process involves adopting a new attitude into one’s belief system?

The process of adopting a new attitude into one’s belief system is known as internalisation. This concept refers to the integration of external beliefs and attitudes into an individual's own personal belief structure, making them a part of the individual’s identity and worldview. Internalisation often occurs through social influences, where a person accepts the attitudes or behaviors of a group or society as their own, leading to a deep and lasting change in personal beliefs.

Conformity involves adjusting one's behavior or thinking to align more closely with the group norms but doesn’t necessarily imply a change in beliefs. Socialisation refers to the broader process of learning and adapting the values, norms, and practices of a culture or society, which can encompass internalisation but is not specifically about the adoption of attitudes alone. Normalization is associated with making behaviors or attitudes standard or typical within a group but does not capture the personal aspect of internalising beliefs.

Given this context, internalisation stands out as the specific process of integrating new attitudes into one's belief system.