Abstract
Software startups develop new products or service using software development under extreme uncertainty conditions. Agile methodologies are considered the most suitable for these teams since they accomodate changes easier than traditional software development methodologies. A very well-known methodology for startups is Lean Startup that is considered to be a variant of agile methodologies. Nevertheless, prior studies found that Lean Startup adoption by software startups are still low. This research will focus to understand why the Lean Startup adoption is not higher despite its fame and history of good results. To achieve that, this research will try to develop a conceptual framework using determinants borrowed from technology adoption theories well-used in information systems literature and also on prior studies on agile methodology adoption. The conceptual framework will then be evaluated through a questionnaire with software startups practioners. It is expected that this conceptual framework could answer why more software startups are not using Lean Startup.