Government agencies have spent lots of money on information system (IS) deployment. However, the partnerships, i.e. public-public partnership (PUP) and public-private partnership (PPP), are less explored in IS domain. Under the concept of social exchange, this study used electronic document management systems (EDMS) in Taiwan government as the target IS for examining the PUP and PPP among agencies and vendors. This study develops a theoretical model that is informed by the literature on partnership and by social exchange theory to explain the aggregated implementation of EDMS. Based on previous literature, this study suggests that the performance expectation is the incentive and affects the support from top-management, trust to others and regulation power from National Archives Administration (NAA) that shape the PUP and PPP in government agencies. To propose the empirical findings, this study collects data from agencies with digital signature used in EDMS. This study establishes the adaption of EDMS in agencies, infers the managerial implication, and compares the findings with other researches to enhance its contribution. Support from top manages and trust to others positively affect the PUP and PPP. The results of the mapping can help identify the research direction of PUP and PPP research.