software development activities、waterfall model and the agile model of software development

1、This question is about software development activities. Please name the four major activities in software development?

requirement analysis

software design

Program coding

software test/Software testing and maintenance

 

2、This question is about the waterfall model and the agile model of software development.

1. a)What is the waterfall model?

2. Waterfall model defines the activities of software life cycle as several stages of work connected in a fixed order, such as waterfall flow, and finally software products can be obtained.

3. b)What is the agile model?

4. Agile software development is an approach to software development under which requirements and solutions evolve through the collaborative effort of self-organizing and cross-functional teams and their customer(s)/end user(s).

5. c)Briefly describe 2 advantages and 2 disadvantages of the waterfall model.

6. advantages:

7. 1) Provide checkpoints by stages for the project.
   2) After the current stage is completed, you only need to focus on the subsequent stage.
   3) The waterfall model can be applied in the iteration model.
   Incremental iteration is applied to the waterfall model. Iteration 1 solves the biggest problem. Each iteration produces a runnable version with additional functionality. Each iteration must undergo quality and integration testing.
   4) It provides a template that enables methods of analysis, design, coding, testing and support to have a common guidance under the template.

8. disadvantages:

9. 1) The division of each stage is completely fixed, and a large number of documents are generated between stages, which greatly increases the workload.
   2) Because the development model is linear, users can not see the development results until the end of the whole process, which increases the development risk.
   3) Tracking project phases through excessive mandatory completion dates and milestones.
   4) The prominent disadvantage of waterfall model is that it can not adapt to the changes of users'needs.

10.  

11. d)Briefly describe 2 advantages and 2 disadvantages of the agile model.

12. advantages：

13. Agile methodologies perform relatively small functions in a few weeks or months, emphasizing the ability to deliver the smallest available functions as early as possible and to continuously improve and enhance them throughout the project cycle.

14. disadvantages：1）With the growth of scale, face-to-face communication becomes more and more difficult.

15. 2）A large number of assumptions or rapid gathering of requirements at the beginning of a project may lead to a misunderstanding of the project, especially when customers have no idea of their own needs.