Govert Veldhuijzen

120 Chapter 6 Figure 1. Applied method for construction and validation of the original cost model (reprint with permission) The model was built in Excel with addition of Microsoft Visual Basic for Applications. Input variables required by the model are categorized as salaries, production numbers, process steps and actors and time spent on process steps. Based on controller input, key performance indicators (KPIs) for conversion, cost savings and time spent were established. We adapted this cost model by excluding the KPI’s. We added the implementation and license costs to the calculation. As most endoscopy units have contractual license agreements for a 5 year period, the implementation costs (such as customizing the CBE with locally shot video material, change management and process integration) were amortized accordingly. In this way, we could establish true costs for three patient routes (nurse counselling, CBE alone and CBE with additional counselling).