Answer: Dissimilar mental models
Explanation: In simple words, mental models refers to the thought process of an individual that build up his or her perception of how the real world works and how he or she should act in a situation.
In the given case, the employees of sharon were not sure of their duties and did not know how to operate. Some of the employees even underestimated the effort needed for the job.
Hence from the above we can conclude that Sharon's employees had dissimilar mental models regarding their jobs.