Theory and practice of the most representative elements of 'lean startup' as agile methodology to help the success of any business, both in a "start up" at an existing company, whether SME or large company.

The basic premises are analyzed to consider for the best application of the method at start of new business projects on business opportunities in any company that wants to bet on the profitability and effectiveness of each initiative to reduce the failure rate of new products or services launched on the market.

To do this the traditional way of starting or running a business project are compared, seeking to highlight the need to focus on customer development process and its impact on the field of innovation in product or service. Particular attention is paid to what transcends our target market as a way to increase the generation of competitive advantage, improve customer experience and increase sales and profits. And describes each of the stages of the path discovery and validation of customers, relying on the explanation of concepts as a model and business plan that will lead to a compelling value proposition and a minimum viable product (MVP) to afford check the actual market interest in our product or service.

It is pathways for competitive reflection and dynamic performance to test ideas and business models, to explore potential to develop after collecting and correctly use the information of customers and users, with representative and illustrative practical examples of the application of this agile methodology and compared to other alternatives as 'Design Thinking'.