The Dutch SPP approach embraces six distinct themes, two of which are unpacked in detail for this study: climate-neutral procurement and circular procurement. Included in these two themes are aspects such as CO2and other greenhouse gas emissions, as well as the reuse of raw materials at the highest possible level of value. SPP is a highly topical issue for a steadily growing number of organisations in the Netherlands: action plans are being written, requirements and criteria are being formulated, and tools are being produced. Together, these activities are creating a growing demand for instruments that evidence the impact of SPP.