Rule-based system
A rule based system is a knowledge -based system, takes place in the rule- based reasoning.
Rule-based systems are composed of
- A database of facts, the fact base
- A set of rules (production rules, business rules ) the rule base (also called business rule repository )
- A control system with rule interpreter ( inference engine also or business rule engine called ).
The rules are in the form: IF ... THEN ... ELSE (IF THEN ELSE) ago. A rule might look like this:
The IF part of the rule is also called the premise of the designated THEN part as a conclusion.
The task of the control system is the identification of suitable rules applying selected rules, as well as updating the database.
Selection mechanisms for the next rule to be applied are either data-driven, goal- driven, or a combination of the two.
Rule-based systems, in addition to case-based systems based on expert systems.
The administration of the rules usually takes place in a business rule repository as part of a business rule management system.
Applications
Rule-based systems are increasingly used in production planning and control, particularly in industries with a wide variety consumer and capital goods, such as in the furniture industry, mechanical engineering and electrical industries. A well-known example is the automotive industry, in which the vehicles are defined by features that can be selected and arranged by the customer via a product configurator. When configuring " THEN IF ... " is on these features in the rules referred to force certain combinations of features ( commandments ) or prevent (prohibitions ). Example: If the customer orders a " convertible", he can not simultaneously order a " sunroof " or when he ordered a fully automatic " air conditioning ," he must also order a stronger "battery." Also for the distribution of the global vehicle orders for vehicle and component plants of an automobile manufacturer to establish the rules. The rules of an automobile manufacturer may comprise thousands of such product and production rules. Meet the characteristics used to define a product, the characteristics of an ideal Boolean algebra, then can - due to complementarity - prohibitions whatsoever as the commandments (and vice versa ) can be expressed. If it is a multi-step algebraic Association, then rules can be ' inherited ' on subsets.