This document introduces accelerator programs and their role in stimulating entrepreneurship in Spain. It discusses how the traditional product development model is no longer valid for high-tech startups due to a lack of iteration and flexibility. It advocates adopting a customer-centric approach based on the Lean Startup methodology, with its emphasis on iterative customer discovery, validation of the business model and marketing strategy, and building a sustainable company. This new model allows startups to pivot quickly based on tangible customer feedback rather than untested hypotheses.