(3)In view of the NCA sub-coordinators' important role in coordinating the JST members from their NCA, it is necessary and proportionate to introduce a uniform process for the provision of performance feedback on NCA sub-coordinators in JSTs. By assisting with the continuous improvement of the NCA sub-coordinators' performance, the SSM performance feedback helps to ensure the proper functioning of JSTs. The SSM performance feedback initially takes the form of a field test that is limited in time. Based on the experience gained during the field test, a more comprehensive implementation of the SSM performance feedback mechanism will be considered. NCAs and the ECB are solely responsible for the performance appraisal of their staff. NCAs may use the feedback provided in accordance with this Decision in the day-to-day management of their staff members, and it may serve as input into the internal appraisal systems of the NCAs, if allowed under the relevant national law.