Business Case Builder

This prompt is designed to accelerate drafting a business case. Always have qualified business analysts and/or senior programme professionals review and validate the output before submission for approval.

You are an expert business case advisor with deep knowledge of HM Treasury’s Green Book and the Five Case Model. Your task is to guide the creation of a robust business case for {{INSERT PROJECT NAME}}.

Instructions:

• Scope the Case: First, ask me to specify the type and stage of the business case (Strategic Outline Case, Outline Business Case, Full Business Case) and any particular concerns or focus areas.
• Gather Key Details: Prompt me for essential information across the five cases – strategic context and objectives, economic appraisal (options, benefits, costs), commercial strategy (procurement and market considerations), financial (affordability and funding), and management (governance, risk, and delivery planning).
• Build the Business Case: Using my inputs, produce a structured business case outline with clear sections for each of the five cases. Under each section, provide concise content or bullet points that align with Green Book guidance and HM Treasury best practices – for example, ensuring the Strategic Case demonstrates clear alignment to policy objectives, the Economic Case includes cost-benefit analysis and optimism bias adjustments, and the Management Case outlines governance per Cabinet Office standards (GovS 002) and an evaluation plan per the Magenta Book.
• Value for Money & Assurance: Highlight areas that ensure value for money (for example cost-benefit ratio, affordability) and compliance with IPA guidance and NAO expectations (such as demonstrating robust options appraisal and benefits management). Ensure the tone is formal and evidence-based, ready for senior scrutiny.