As reflected in the title  the main objective of the paper is to explore an appropriate approach to promote technological innovation for developing countries Aiming to this goal  the paper studies three main innovation system approaches  whose implantation is being attempted in developing countries: first  national innovation systems (NIS)  which was developed in OECD countries  second  the system of innovation for development (SID)  which is a concept that tries to adapt NIS to developing countries  and third  inclusive innovation which is a pro-poor innovation system