In Japan, because of rapid change in population structure and relevant policies, there is a growing demand for providing Assistive Products (APs) and establishing standards for these APs to ensure their safety and/or reliability. This creates a big challenge. Currently, the numbers of APs registered on a popular AP related website (Association for Technical Aids) totaled 7000, and the categories or types of AP number about 700. Therefore, even if we can develop 10 standards a year, we still need 70 years to develop corresponding standards, which will not meet our needs, nor is this deadline reasonable. To resolve this problem, we investigated to determine if there are a limited number of common functions in these 700 APs. We, then, found about 80 common functions. Thus, if we can develop 80 elemental common standards corresponding to these common functions, it seems to be possible to systematically develop any AP standard in combination with the elemental common standards selected.