Organizations have business rules for managing business objects. In many cases, business rules regulate how important business objects change states and are applicable only when object is in a particular state. Requirement modelling is one of the important tools to understand these changes. The states also serve as a part of terminology, which will be used in other business and requirements models. State machine diagrams should be created only for those business concepts that have dynamicstates. Business modellers should define triggers on all transitions in state diagram.