This study purposes the application of IF- THEN rules in a decision model of the survey. The knowledge given to the system is through a user input that will make computer purchases. Knowledge will be designed into a decision model that is formed from the forward chaining models. Completion of this study is using the model of Simon, which consists of the intelligence phase, design phase, and choise phase. In the intelligence phase created a collection of knowledge about the purchase. Design phase is the implementation of IF- THEN rules are designed using forward-chaining rule. The choise phase is the last stage to make a decision by the user for transactions made. Result from this study is a survey models created in a web-based electronic forms, which give a decision based matching rules through forwardchaining rule. So, the system can show the results in transactions that would be required by the buyer