“One common method provides a group with a rating scale to use in forming a single response obtained through open discussion.,,By focusing on direct interaction within the group, this approach begins to address collective origins and development of the construct but does not allow assessments of sharedness, unless paired with other measures. A popular alternative method focuses on capturing sharedness using an average of members’ individual estimates of group efficacy, thus making estimates of within-group agreement possible.” (p.452)

Gibson, C. B., & Earley, P. C. (2007). Collective Cognition in Action: Accumulation, Interaction, Examination, and Accommodation in the Development and Operation of Group Efficacy Beliefs in the Workplace. The Academy of Management Review, 32(2), 438–458. doi: 10.5465/amr.2007.24351397