Final answer:
Using the GAS approach, a score of 0 indicates that Gwen has met the expected outcome for her occupational performance in feeding.
Step-by-step explanation:
When using the Goal Attainment Scaling (GAS) approach, the rating scale typically ranges from -2 to +2. A score of 0 indicates that the expected outcome has been met. Since Marci and Gwen's family are assessing Gwen's occupational performance in feeding and they agree that she has met the expected outcome, the correct rating to give would be 0. A rating of +2 would indicate performance much better than expected, -1 would be somewhat less than expected, and +1 would be somewhat more than expected. Since Gwen's performance met the goal as expected, none of those other ratings apply.