  Expert System is developed as consulting service for users spread or public
requires affordable access. The Internet has become a medium for such services,
but presence of mobile devices make the access becomes more widespread by
utilizing mobile web and WAP (Wireless Application Protocol). Applying expert
systems applications over the web and WAP requires a knowledge base
representation that can be accessed simultaneously. This paper proposes single
database to accommodate the knowledge representation with decision tree mapping
approach. Because of the database exist, consulting application through both
web and WAP can access it to provide expert system services options for more
affordable for public.
