Which aspect is least likely to impact the effectiveness of primary nursing implementation?

The effectiveness of primary nursing implementation is heavily influenced by factors directly related to the nursing staff's capacity to deliver care and the logistical aspects of their work environment. Staff training and education ensure that nurses are well-prepared to implement primary nursing practices effectively, while patient caseload numbers directly affect the amount of time and attention each nurse can devote to their patients. Additionally, staff salary adjustments can impact job satisfaction and retention rates, which in turn influence the overall effectiveness of nursing teams.

On the other hand, nursing supply purchases, while important for operational effectiveness, have a more indirect relationship with the implementation of primary nursing. These supplies might contribute to the nursing environment, but they do not directly affect how nurses manage their relationships with patients or how they apply primary nursing principles. Therefore, amongst the options provided, nursing supply purchases are the least likely to impact the effectiveness of primary nursing implementation.