The difference between the Warnier method and the Jackson method

The Jackson method is a structured approach to data structures.

Detailed design.

The design method for data structures (Jackson method) is a formal method for detailed design.

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The main task of the outline design is to convert the system extension use case diagram derived from the requirements analysis into a software structure and data structure. The specific tasks of designing the software structure are: dividing a complex system into modules according to functions, establishing the hierarchy and invocation relationship of modules, and determining the interfaces and human-computer interfaces between modules.

Data structure design includes the description of data features, the determination of the structural characteristics of data, and the design of databases. Obviously, the outline design establishes a logical model of the target system.

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In the mid-60s of the last century there was a well-known software crisis. In order to overcome this crisis, the term software engineering was coined at two prestigious NATO conferences held in succession, and has been continuously developed and refined since then. At the same time, software researchers are constantly exploring new approaches to software development.

To date, eight types of software development methodologies have been developed.

One of these is a data-oriented approach to software development

A software development approach for data structures.

1. Jackson method.

In 1975, M A Jackson proposed a class of software development methods that are still widely used today. This method starts from the input and output data structure of the target system, exports the program framework structure, and then adds other details to obtain a complete program structure diagram. This approach is particularly effective for small and medium-sized systems with well-defined input and output data structures, such as file processing in commercial applications.

This method can also be combined with other methods for the detailed design of modules.

The Jackson approach is sometimes referred to as a data-structure-oriented approach to software design.

2. Warnier method.

In 1974, J D Warnier proposed a software development approach similar to the Jackson method. There are three differences: first, they use different graphical tools, using Warnier diagrams and Jackson diagrams respectively; Another difference is the use of different pseudo-codes; The main difference is that when constructing the program framework, the Warnier method only considers the input data structure, while the Jackson method considers not only the input data structure, but also the output data structure.