Course: Modern Technologies of System Development (gknm inta064) Topic: Software Development Technology Gyor, 2022 Otabek Atashev- elnzz9 Contents

The waterfall model strictly follows the sequence of all stages of software development and does not imply a return from the current stage to the previous one. Now this model is practically not used, except in very small projects.
V-shaped development model

Pic.3 V-shaped model
From the figure you can see that in the V-shaped model it is possible to return to some stages of development and clarify the necessary requirements.
Prototyping model

Pic.4 Prototyping model
Prototyping involves the creation throughout the development process of several working versions of the program (prototypes) with incomplete functionality. In the first prototype, only one application interface can be implemented.
Spiral model

Pic.5 Spiral model
In a spiral model, all stages of development are sequentially repeated in a circle until the current version of the program becomes fully compliant with the requirements. Here, too, you need to have a limit and stop in time.
Conclusion
So, several approaches to determining the software life cycle were considered. In my opinion, all of them have the right to exist, since to one degree or another they reflect the practice of programming. Moreover, it is easy to detect common points (the task is set - the system is determined - the requirements are analyzed; program maintenance - maintenance - operation and maintenance).
Based on this report, it is clear how important and necessary it is to know the needs of the modern world when compiling a software product (product). It is important when compiling a program for automation, any system, to take into account the fact that the modern world is constantly changing, which means that the program should be capable of change.
It is also important, when drawing up a program, to take into account the fact that the program must be accurate; complete in its content and suitable for working with both small and large problems in accordance with its purpose; clear - so that the user can calmly, without difficulty, work with it. As well as so that the program at any time could be easily corrected or supplemented in accordance with the changed requirements in the modern world.
It should be remembered that good programming is not the coding of a quickly found solution using any suitable technique, but a carefully instrumented engineering procedure that allows you to create complete, accurate and easily understood (clear) software.