This model shows a sequential scheme of activities; for obtaining functional requirements; In the process prior to the construction of the software, far only from the notion and classification of the requirements made by various authors, this model shows how the instruments that will capture the source information are progressively constructed, so that it can be treated progressively until reaching a specification of functional requirements, all this starts from the identification of the development context, definition of stakeholders to achieve the requirements specification, the latter is done in three steps; which are education, elicitation and finally the requirements specification.