and adjustments. (iii) Quality measure working group (I) In general Not later than September 1, 2018, the Secretary shall convene a quality measures working group (in this clause referred to as the working group ) for purposes of establishing quality measures (as defined in clause (ii)(IV)) that may be used by a PDP sponsor (as defined in clause (ii)) under this part. (II) Composition The working group shall consist of representatives from each the following: (aa) PDP sponsors. (bb) Pharmacies representing all pharmacy practice types. (cc) Pharmacy benefit managers. (dd) Patient advocacy organizations. (ee) Such other entities as the Secretary determines appropriate. (III) Duties The working group shall provide for the establishment of quality measures that may be used by a PDP sponsor (as defined in clause (ii)) with respect to incentive payments and adjustments (as defined in clause (ii)(IV)) for a pharmacy under this part. Such measures established by such group shall include only such measures that— (aa) are reasonable and relevant with respect to the practice type of the applicable pharmacy