This book presents the findings from a cross-sectional survey funded by CIMA. The project aimed to survey senior management accountants working across a range of organisations and industries with a unique focus on the behavioural side of decision making, the use of managerial judgement. Previous capital budgeting surveys have tended to focus on the quantitative evaluation tools and techniques used for project appraisal. This study was broader in that it asked about every stage of the strategic investment decision (SID) process, from initiation to post implementation review, and how different managers were involved at different stages of the process. The focus is on how decision judgements are reached. This book reflects the widespread support for an emerging model of the strategic investment decision process, involving accountants and other managers in up to ten stages With a much broader focus than existing literature, the report covers all stages of strategic investment decision (SID) process, the types of SID and how multiple managers participate in the process The research explores the role that managerial judgement plays in the SID process including insight on how human behaviour might influence decisions and how managerial judgement might be exercised. Findings from this publication may assist organisations in benchmarking their own SID practice.