Purpose – The aim of this paper is to explore the factors that influence buyer decision-making in public procurement. The objective is to better understand the processes and conditions that support different supply arrangements, which maximise SME participation. Design/methodology/approach – The paper uses case study evidence of contract awards across multiple organisational contexts including: a local authority, commercial semi-state, police force, and a tourist agency. Findings – National policy and the role of procurement exerted mixed effects upon the cases. The procurement processes were broadly similar and included cross-functional teams, consideration of trade-offs and market research. Research limitations/implications – The paper highlights the transition of public organisations toward strategic procurement including supplier engagement. Practical implications – This offers buyers a decision support tool that promotes equal opportunities for SME participation, a key goal of EU procurement. The imp...