Describe two psychological theories of motivation.

Theories from the humanist psychology and the social psychology described two kinds of motivation. The extrinsic motivation results from external stimuli and the intrinsic motivation from the organism himself. ... Anyway, motivation is a concept infered from behavior. Therefore, its evaluation could only be secondary.

Content Theories of Motivation. Maslow's theory of the hierarchy of needs, Alderfer's ERG theory, McClelland's achievement motivation theory, and Herzberg's two-factor theory focused on what motivates people and addressed specific factors like individual needs and goals.

Loss in amenity , biodiversity , which are most difficult to assess