1) Maintenance timing and methods 
Data correction and updating are important tasks to ensure that [accurate and timely] information is 
available. Besides the improvement of operation procedures when the system is introduced, effective 
data correction/updating remain themes of prime importance to ensure the proper maintenance of data 
bases. 
2) User interfaces 
At many government municipalities, work processors, personal computers, etc. have become more 
popular recently. Furthermore, there is an increasing desire to use EWS systems to update data with as 
much ease as using a work processor. Although GUI has been well developed by using bar menus, pull- 
down menus, or eye controllers, we believe that there is still room for improvement. 
3) Response improvement 
As a result of improvements in hardware processing functions, the response speed of a GIS that employs 
relational data bases has been drastically increased. However, to effectively take care of the many 
inquirers who often form long lines at office counters, increased speed in total response (including 
retrieval, displays, and output) is required . This certainly is another important point which deserves to 
be studied further in connection with the structuring of future systems. 
REFERENCES 
Namiki,T.,1992.Development of road maintenance system using digital road map.12th ARC/INFO users 
conference proceedings(in printing). 
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