This paper aims at formalizing an innovation process well suited for small- and medium-sized enterprises (SMEs) specialized in retail. The design research consisted in analyzing conceptual models of innovation process from the literature and adapting it to the specific context. Indeed, the research issue deals with encouraging innovation activity in the context of small- and medium-sized retailers that have not yet integrated an intern design department. In the actual financial context, it is essential for SMEs to innovate in order to gain competitive advantage; but how to start a sized innovation activity? The undertaken research results in a plan that sets up a sized innovation activity gradually with a methodology conducting to repeated and regular new product development. Supported with international literature research, the paper contributes to the proposal of an innovation process meeting the two following requirements:a retailer lacking knowledge in innovation activity andan SME with limited financial means.From the industrial case studies that have been undertaken, an adapted process has been developed to ensure the success of innovation activity integration in this specific context.