Answer to Question 1
Idiosyncrasy credit is the freedom to violate group norms without being punished. A group member's above-average contributions to the group give him or her idiosyncrasy credit.
Answer to Question 2
Group efficacy is the shared belief group members have about the ability of the group to achieve its goals and objectives.
The following factors enable members to share a belief about the group's ability to coordinate and mobilize its members to perform effectively: its composition, members' willingness to work together and share information, the resources the group has to work with, and the extent to which the group is able to develop effective strategies to achieve its goals.
Group efficacy develops over time, as members understand each other and learn the functions of the group, the tasks it needs to accomplish, and the group's capabilities. Efficacy is not something that exists when a group is initially formed but rather a shared belief that emerges as members work together.
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