Business plan writing seems the panacea to gain stakeholder legitimacy and financial backing. Our chapter explores the contributions and disconnections between business plan writing and the start-up process for incubated technology entrepreneurs. The study is set in the South East Enterprise Platform Programme (SEEPP), an incubator programme for technology graduate entrepreneurs in the South East of Ireland. Using a purposive sample of technology entrepreneurs in start-up mode, we took a qualitative approach consisting of content analysis of 40 business plans and in-depth interviews with 25 technology entrepreneurs. Our research found that writing a detailed business plan constrains the technology entrepreneur's natural penchant for action, compelling them to focus on business plan writing rather than enactment. Technology entrepreneurs favour a market-led rather than funding-led operational level document to plan, and learn from, near-term activities using milestones.