مثال على usecase diagram

requirements 

analysis

design

implementation

testing

maintenence

waterfall model vs agile model

waterfall model used is used when:

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large team members

large project

big duration

clear requirements

agile model is used when:

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small team members

small and medium project

small duration

unclear requirements

exterme programming: نفس مراحل الشلال, لكن مع اختصار التحليل والتصميم بمرحلة واحدة, المتطلبات تكون على شكل سيناريوهات وقصاصات ورق

Rapid Application Development(RAD): يتم حذف مرحلة التحليل والتصميم

Functional requirements: what system do? المتطلبات الوظيفية

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user:

1.must be able to signup:.....

2.must be able to login:....

3.must be able to change password

4.must be able to add post: there are to type categories of groups: books market, lost things, general query

5.must be able to edit post:...

6.must be able to  delete post

7.must be able to browse the posts in application

8.must be able to comment on a post

9.must be able to browse messages

10.must be able to send message to user

admin:

1.monitor private messages between users.

2.monitor the added posts(approve or reject)

3.login to the admin control panel

4.change password

usecase diagram:  هو مخطط لتمثيل المتطلبات الوظيفية

non-functional requirements: conditions and contraints شروط وقيود

protoypes: عبارة عن صور واجهات الاستخدام التخيلية المبدئية