RESUMEN ANALITICO La ingenieria de software busca defnir procesos, controlarlos y seguirlos con el fn de construir productos de calidad que garanticen al usuario su satisfaccion, generalmente medida en terminos de funcionalidad del producto, pero pocas veces evaluada en terminos de usabilidad del mismo. Este articulo presenta un modelo para el ciclo de vida de desarrollo de software, basado en la metodologia Human-Centered Design (HCD) en el cual son integrados algunos metodos utilizados en el diseno de producto (diseno industrial). Este modelo incluye metodos de usabilidad (efciencia, efcacia y satisfaccion) y tecnicas para el diseno de interfaces grafcas de usuario (apreciacion y estetica). La investigacion utilizo una metodologia de analisis cualitativo a traves del analisis de la experiencia de una PYME de desarrollo de software. Por ultimo, se utilizo el modelo de referencia Capability and Maturity Model Integrated (CMMI) para la validacion del modelo propuesto. PALABRAS CLAVES: Usabilidad, Diseno Centrato en el Usuario, Diseno como Proceso, Ciclo de Vida del Producto. METHODOLOGICAL APPROACH FOR INTERFACE DESIGN DURING SOFTWARE DEVELOPMENT LIFE-CYCLE ANALYTICAL SUMMARY Software engineering looks for defning, controlling and following processes, it aiming to construct high quality products in order to guarantee user satisfaction. Usually, it is measured in functionality terms, but few times measured from the perspective of usability. This paper presents a life cycle model of software development, based on the Human Centered Design (HCD) methodology, which integrates some methods used in product design (industrial design). The model includes usability methods (effciency, effcacy and satisfaction) and techniques for graphic user interfaces (aesthetic and visual perception). The research uses an analytic qualitative methodology approach by the experience of a SME (Small and Medium Enterprises) of software development. Finally, Capability and Maturity Model Integrated (CMMI) was used as reference for validating the model. KEYWORDS: Usability, Human-Centered Design, design as process, product life cycle.