Indonesia was the big fifth smartphone user
in the world, smartphone user always increase signed by
the increasing internet user. This research was
conducting to know the users necessary to buy
smartphone based on their characteristic. Forward
chaining method was using rule base and "if then"
principle, which is provide convenience to search. This
research was using three criterias and three costs range.
The three criterias was consisted by hobby, job and
social networking. Each of criteria has four questions
that users have to answer. The forward chaining
method was implemented to the system by PHP
programming language and database MySql. The test
was resulting about 21 matching data which was
conducting the test by the rule base system
implementation. These 21 data was matching by the
rule base and give the accuracy about 100%.
Keywords : Forward chaining, Rule base, Smartphone.