Final answer:
Using existing case records as the data source for evaluating client progress has limitations, including restrictions in scope, potential inaccuracies, and the need for client consent.
Step-by-step explanation:
When using existing case records as the data source for evaluating client progress, one limitation is that the scope of the evaluation is restricted to the information explicitly stated in the file (option C). This means that any additional or relevant information that may contribute to a comprehensive evaluation may be missing.
Another limitation is that client progress may not be accurately represented in the case records, as they may not capture all relevant factors or changes over time.
Lastly, using existing case records for evaluation usually requires client consent in writing (option D) to ensure ethical and legal compliance.
Learn more about limitations of using existing case records for evaluating client progress