Learning refers to alterations of thought or behavioral intentions. Learning results from experience and is concerned with the attainment of individual, group or societal goals in the sustainability domain. Learning is often social in nature, and usually distinctions are made between learning at a factual level (this is needed for other levels of learning as well), normative learning - changes in appreciations and priorities, and relational learning - learning that pertains to networks, reputations and levels of trust.