When managers engage in rigorous debate to solve a problem, one technique they might use is to to ensure the group's assumptions are challenged. another is , in which the group breaks into two subgroups that work separately and then exchange proposals?

When managers engage in rigorous debate to solve a problem, one technique they might use is to appoint a devil’s advocate to ensure the group’s assumptions are challenged. Another is point-counterpoint, in which the group breaks into two subgroups that work separately and then exchange proposals.
The devil’s advocate  has the role to challenge the group’s assumptions and assertions , while point-counterpoint assigns different responsibilities to the two subgroups.