Treffer: Object Oriented systems analysis and definition of manufacturing operations.

The article focuses on object oriented systems analysis. The main difference between conventional and object-oriented methodologies is that the former models a system at the system or sub-system level, whereas with object-oriented approach the system is modeled at the level of individual entities within the problem domain. Object-oriented paradigm provides an excellent approach to manage and express complex entities through data abstraction, encapsulation and inheritance. With this new perspective, a system consists of a collection of objects which are an encapsulation of data, and whose functionality is obtained by defining a set of messages to which they respond. The modularized system structure consists of system units which can be combined to execute the required application, and yet each of these units can be implemented or modified independently without affecting any other modules in the system. Such an approach facilitates rapid system design/development by reusing components already available. Once a system component is defined, it can be used as the basis for other similar components, hence reducing duplicated effort in system development and modification.