Agile software development

Agile software development

Nội dung

1. Waterfall Model 2. Agile software development3. Extreme Programming (XP)4. Agile vs Waterfall  

Waterfall Model"From the 1970 IEE paper

"Managing the Development of Large Software Systems“

Winston Royce's Waterfall Model 

Waterfall Model

Waterfall ModelRequirement

◦Each phase should pass iteratively to the next 

◦The entire process should be exercised twice before release

◦Royce knew that a single pass will fail

Agile software development

ValuesIndividuals and

interactions over processes and tools

Working software over comprehensive documentation

Customer collaboration over contract negotiation

Responding to change over following a plan

Principles

1) 12 principles

Extreme Programming (XP) 

Agile development is not a methodology. It is an umbrella term that describes several agile methodologies

PracticesIncremental planningSmall Releases Continuous integration Test first developmentRefactoringPair ProgrammingCollective OwnershipOn-site CustomerSimple design

Cycle

Extreme Programming (XP) 

ExampleStory card for document

downloading

Downloading and printing an article

First, you select the article that you want from a displayed list.

You then have to tell the system how you will pay for it; this can either be through a subscription, though a company account or by credit card.

Alter this, you get a copyright form from the system to fill in.

When you have submitted this, the article you want is downloaded onto your computer.

You then choose a printer and a copy of the article is printed.

You tell the system printing has been successful. If the article is a print-only article, you can't keep

the PDF version, so it is automatically deleted from your computer.

Task cards for document downloading

Test: Test credit card validityInput: A string representing the credit card number and two

integers representing the month and year when the card expires

Tests: Check that all bytes in the string are digits Check that the month lies between 1 and 12 and the

year is greater than or equal to the current year. Using the first 4 digits of the credit card number, check

that the card issuer is valid by looking up the card issuer table.

Check credit card validity by submitting the card number and expire date information to the card issuer

Output: OK or error message indicating that the card is invalid

Agile vs Waterfall Ability to change

Agile vs Waterfall Visibility

Agile vs Waterfall Successful

Agile vs Waterfall

Agile vs Waterfall Agile Waterfall

Small, medium project

Big project

Less architectural Better architectural

Sourcehttp://www.agilemodeling.comhttp://

www.codeproject.com/Articles/604417/Agile-software-development-methodologies-and-how-t

Bài giảng môn lập trình cấu trúc, Cô Giang