In what kinds of groups is groupthink most likely to be a problem? when is it least likely to be a problem? what steps can group members take to ward off groupthink?

The correct answer is that groupthink can be a problem in very unified and cohesive groups.  The group members could be so invested in making a unanimous  decision that they do not see other possibilities. On the other hand,  It is least likely to be a problem when managers have used up all their resources and are in need of some new  ideas.  Some of the solutions for this problem are improved  meeting agenda,  balanced staff work, and constantly competing views.  

in about winter like late november to january

sir frederic attributed inaccuracies to schemas. memory reconstruction is one part actual events and one part personal schema, which can result in inaccuracies when memories are reconstructed.