A apparatus implemented using a programmable computer that automatically generates the rules required by a software rules engine as a process flow diagram is designed. The apparatus includes a developer interface; an editing interface, and a rules generator. A developer interface enables the user to define functions and variables together with their properties from the business application. An editing interface allows the user to define the logical rules the business would follow in performing the business application by constructing a process flow diagram and associated tables using the functions and variables defined in the developer interface. The rules generator then automatically parses the flow diagrams and tables defined by the business user and, using the functions and variables defined in the developer interface, generates rules for a rules engine. The rules can then be deployed to a controller that implements the process automatically based on the input rules.