Agile development of software development pattern (scrum)

brief introduction

In recent years, agile development has been more and more widely used in Internet enterprises , Those who use more are scrum Agile development and xp agile development , Everyone is talking about agile development . So what is agile development ？

Catalog

1. What is agile development ？
2. Comparison between traditional development mode and agile development mode ？
3. agile development scrum Implementation .

What is agile development

Agile development is centered on the evolution of users' requirements , Use iterations 、 Step by step approach to software development .

In Agile Development , Software projects are divided into several subprojects at the beginning of construction , The results of each subproject have been tested , Have visibility 、 Features that can be integrated and run . In other words , It is to divide a large project into multiple interconnected projects , But small projects that can also run independently , And do it separately , In the process, the software is always available .

Comparison between traditional development mode and agile development mode

Waterfall model ：

advantage ：
1. Provide checkpoints for projects by phase .
2. After the completion of the current phase , You just need to focus on the next phase .
3. It provides a template , This template makes the analysis 、 Design 、 code 、 Testing and supporting methods can have a common guidance under the template .

shortcoming ：
1. The division of each stage is completely fixed , A lot of documents are generated between stages , It greatly increased the workload .
2. Because the development model is linear , Users can only see the development results at the end of the whole process , This increases the risk of development .
3. Track project phases through too many mandatory completion dates and milestones .
4. The outstanding disadvantage of waterfall model is that it doesn't adapt to the changes of users' needs .

Agile model ：

advantage ：

1. High adaptability of agile development , People oriented characteristics .
2. More flexible and make full use of the advantages of each developer , Mobilized everyone's work enthusiasm .

shortcoming ：

1. Because of its long project cycle , So it's hard to ensure that developers don't change , Without documentation, there will be great difficulties in the handover process .

agile development scrum Implementation

Scrum Football is a professional term for football , Express “ Scrimmage ” The action of ; Name a development process as Scrum, It's like everyone is as fast as playing football 、 Full of fighting passion . and Scrum It's such a development process .

Scrum Three roles in development process
– Product owner （Product Owner）

It is mainly responsible for determining the function of the product and meeting the required standards , Specify the release date and delivery content of the software , At the same time, have the right to accept or reject the work of the development team .

– Process administrator （Scrum Master）

Mainly responsible for the whole Scrum Smooth implementation and progress of the process in the project , And remove the communication barriers between customers and development , Enabling customers to drive development directly .

– The development team （Scrum Team）

Mainly responsible for software products in Scrum Development work under specified process , Control the number of people in 5~10 Left and right , Each member may be responsible for different technical aspects , But each member must have strong self-management ability , At the same time, it has certain expression ability ; Members can work in any way , As long as we can Sprint The goal of .

scrum Development flow chart

1、 We first need to identify a Product Backlog（ Product demand list ）, This is by PO conscientious （ Pictured （ One ））;

2、 With Product Backlog list , We need to pass Sprint Planning Meeting（Sprint Planning meeting ） To pick out one of them Story As the goal of this iteration , The time period of this goal is 1~4 A few weeks , And put this Story Refinement , To form a Sprint Backlog;

3、Sprint Backlog By Scrum Team Finished , Each member according to Sprint Backlog Refine it into smaller tasks （ Detailed to the workload of each task 2 Within days ）;

4、 stay Scrum Team Complete the plan selected at the meeting Sprint Backlog In the process , Need to carry out Daily Scrum Meeting（ Daily Scrum Meeting ）, Every meeting is controlled at 15 About minutes , Everyone has to speak , And report to all members face-to-face about what you accomplished yesterday , And promise all members what you're going to accomplish today , At the same time, problems that cannot be solved can also be raised , After everyone answers , Go to the blackboard and update your own Sprint burn down（Sprint Burnout figure ）（ Pictured （ Two ） And as shown in the figure （ 3、 ... and ））;

5、 Daily integration , That is to say, every day there must be one that can be successfully compiled 、 And a demo version .

6、 When one Story complete , That is to say Sprint Backlog Be completed , It means once Sprint complete , At this time , We're going to Srpint Review Meeting（ Demo Meeting ）, Also known as review meeting , Product owners and customers should participate （ It's better for our boss to attend ）, every last Scrum Team All the members of the company have to show them the software products they have completed .

7、 The last is Sprint Retrospective Meeting（ Retrospective meeting ）, Also known as wrap up meeting , In turn , Everyone has to speak , Summarize and discuss improvements , Put in the next round Sprint In the product demand of ;

Pictured （ One ）：

Pictured （ Two ）：

Pictured （ 3、 ... and ）:

Pictured （ Four ）:

Agile development management tools ：teambition
teambition

Reference resources

Agile development Scrum Literacy
Baidu Encyclopedia
agile development Model explanation