What tools might be included in the design phase of the policy process to increase the probability of success?

PolyPharmacy and Policy

Look at case study number two, PolyPharmacy Problems, p. 166 of Health Policy and Politics, A Nurses Guide, by Milstead. Formulate a policy to reduce the practice of multiple drug prescriptions. What tools might be included in the design phase of the policy process to increase the probability of success? What research from other countries could be helpful in addressing this issue? Support your reasoning.
Include at least 3 references