The transition of cities towards a smarter approach greatly benefits from citizen participation in the development and implementation of innovative ICT products and services. Despite the emergence of various initiatives in recent years aimed at guiding the development of smart cities; there is still a lack of effective strategies to actively engage citizens, businesses, and educational institutions in the development of such products and services. This article describes a method based on co-creation techniques that facilitate the ICT software-as-a-service process in collaboration with stakeholders. This method consists of five phases (Focus, Ideation, Detailing, Prioritization, and Validation); in each one a co-creation technique is proposed to promote active participation, stimulate idea generation, and facilitate the creation of the necessary documents and elements for the development of the desired software.