Comparison level only predicts how satisfied a new member will be with the social relationships within the group. To determine whether people will actually join or leave a group, the value of other, alternative groups needs to be taken into account. This is called the comparison level for alternatives. This comparison level for alternatives is the standard by which an individual will evaluate the quality of the group in comparison to other groups the individual has the opportunity to join. Thiabaut and Kelley stated that the "comparison level for alternatives can be defined informally as the lowest level of outcomes a member will accept in the light of available alternative opportunities.”