A common practice agreement may be described as a council agreement, a doctor-pharmacist agreement, a standing order or a medical protocol or delegation. While ASAs are not a prerequisite for collaborative care, they can be used to improve the effectiveness and efficiency of collaborative care. If harnessed to their full potential, ASAs have the opportunity to improve access to care, expand services available to patients, increase the efficiency and coordination of care, and use pharmacists` medication skills to complement the skills and knowledge of other members of the health team. According to health researcher Karen E. Koch, the first expression of the notion of “collaborative management of drug therapy” can be attributed to William A. Zellmer`s 1995 publication in the American Journal of Health System Pharmacy.  Zellmer supports the use of the notion of “collaborative management of drug therapy” rather than “prescribing” and argues that this will make legislation that expands the authority of pharmacists more tasty for legislators (and physician interest groups). This may include prescribing activities that include selecting and launching medications to treat a patient`s diagnosed illnesses (as described in the CPA), stopping the use of prescription or non-prescription drugs, and changing a patient`s drug treatment (e.g.: CCPA regularly publishes updates on this, with previous publications in 2003 and 1997. The document describes the recent history of ASAs, legislative progress and discusses payment models for collaborative drug management.  The CDTM is an extension of the traditional pharmacist sector that enables pharmacist-led medication problem management (DRPs), with a focus on a collaborative and interdisciplinary approach to pharmacy practice in the healthcare sector. .