UGC NET CSE | December 2012 | Part 3 | Question: 54

Question

The Object Modelling Technique (OMT) uses the following three kinds of model to describe a system

• A. Class Model , Object Model and Analysis Model
• B. Object Model, Dynamic Model and Functional Model
• C. Class Model, Dynamic Model and Functional Model
• D. Object Model, Analysis Model and Dynamic Model

Answer 1

Ans : B

The Object-Modelling Technique (OMT) describes Object model or static structure of the system.
 The purposes of modelling are:
·      testing physical entities before building them (simulation),
·      communication with customers,
·      visualization (alternative presentation of information), and
·      reduction of complexity.
OMT has proposed three main types of models:
·      Object model: The object model represents the static  modelled domain. Main concepts are classes and associations with attributes and operations. Aggregation and generalization (with multiple inheritance) are predefined relationships.
·      Dynamic model: The dynamic model represents view on the model. Main concepts are states, transitions between states, and events to trigger transitions. Actions can be modelled as occurring within states. Generalization and aggregation (concurrency) are predefined relationships.
·      Functional model: The functional model handles the process perspective of the model, corresponding roughly to data flow diagrams. Main concepts are process, data store, data flow, and actors.
OMT is a predecessor of the Unified Modelling Language (UML).