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The difference between Structured Analysis/Structured Design (SA/SD) and Object modeling technique (OMT) is primarily a matter of style and emphasis. In the SA/SD approach, the functional model dominates, the dynamic model is next most important, & the object model least important. In contrary to this, OMT modeling regards the object model as most important, then the dynamic model, & finally the functional model.
The Structured Analysis/Structured Design approach organizes a system around procedures. On the contrary, an object oriented design technique organizes a system around real world objects, or conceptual objects that exist in the user's view of the world. Most changes in requirements are changes in function rather than in objects, so change can be disastrous to procedure based design. By contrast, changes in function are readily accommodated in an object-oriented design by adding or changing operations, leaving the basic object structure unchanged.
An SA/SD design has a clearly defined system boundary, across which the software procedures must communicate with the real world. The structure of a SA/SD design is derived in part from the system boundary, so it can be difficult to extend a SA/SD design to a new boundary. To the contrary, it is much easier to extend an object-oriented design.
In SA/SD the decomposition of a process into sub-processes is somewhat arbitrary. Different people will produce different decompositions. In the object-oriented design the decomposition is based on objects in the problem domain, so developers of different programs in the same domain tend to discover similar objects. This increases reusability of components from one project to the next.
The object-oriented approach better integrates databases with the programming code. One common uniform paradigm, the object, can model both database and programming structure. In contrast, a procedural design approach is inherently awkward at dealing with databases.
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