Abstract
This paper proposes a mixed integer linear programming (MILP) model for a hybrid appointment system (HAS) that schedules patients based on their preference while minimising the total loss of the system. The HAS proposed is a combination of three scheduling methods, namely walk-ins, pre-booked, and open access. The model supports the decision maker in determining the rejection and overtime rates of the health system under consideration. The HAS is analysed for the impact of different parameters, namely proportion of patients requesting open access (OA ratio), patient no-shows, and variation of service time on the optimal rejection rate and overtime rate. The results indicated that the HAS can handle variations in clinic's operational factors (variation of at least 20% in OA ratio and service time) without significantly impacting the performance measures. Furthermore, sensitivity analysis indicated that the model is not impacted when the demand fluctuation is within 40%.
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