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The observed objects of the DSS are the people that are living in a geographically defined area, and their demographic events, including their causes of death and to a certain degree their illness episodes. The observed objects in the HMIS are basically the health services provided within a clearly defined area and their clients, which are using these services (those which are not using the services usually remain unknown).
Linking the two systems on this level could provide answers on questions focused around whether the services are really achieving the targeted coverage, but also whether the self-diagnoses, recorded in the DSS, could be verified in the services. While it is easy to match the targeted villages, it is extremely difficult to identify the individual people seeking health services. ID cards for individuals could provide a solution, but are costly to implement and have serious limitations.
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