What legal implications can arise from poorly written job descriptions, if any?

Clear Expectations Establish Accountabilities
Properly formatted job descriptions provide a specific outline of the job requirements; however, there are times that there are assumed expectations built into the description that are not clearly communicated.

Prior to beginning work on this discussion forum,

Read Chapters 6 and 7 in the course textbook the Performance Appraisal Tool Kit.

Think about a time or situation where you were evaluated on an action, task, or behavior and were not clearly provided the directions or expectations before evaluation.

In your initial discussion forum post,

Briefly describe the situation and any ramifications that resulted from not being given clear directions.

What actions should the human resource manager have taken to provide clear communication so no misunderstanding of the expectations occurs before the evaluation?

What legal implications can arise from poorly written job descriptions, if any?