PBMs or pharmacy benefit managers provide transparency and disclosure to a level demanded by the competitive market and generally rely on the demands of prospective clients for disclosure in negotiating their contracts. The best proponent of transparency is informed and sophisticated purchasers of PBM services. The purchaser needs to understand not only what they want to achieve in their relationship with their PBM but also the competitive market and their ability to drive disclosure of details on services important to them. Assessing transparency is more effectively done by a trained eye with personal knowledge of the purchaser’s benefit and disclosure goals. The Certified Pharmacy Benefit Specialist (CPBS) educational offering includes knowledge and assessments that are critical to cost-effective management of the pharmacy benefit.