Method
Using the World Health Organisation’s Workload Indicators of Staffing Need (WISN) methodology, a two-round Delphi consensus study with an Expert Panel of UK hospital pharmacy managers was undertaken to develop the Activity Standard for pharmaceutical care and to identify the time unavailable for clinical work inherent in employing staff. Consenting Panel members then tested the CPWC by calculating the staff resource required for three staffing scenarios to determine whether it could be reliably used by different operators.