Class Diagram, The function container of a system

I am very new for class diagram. I tried to introduce class diagram as a initial point of view, I hope it will help. I follow UML 2.0.....(CLICK & DOWNLOAD)

Activity Diagram,The business and operational work flow representing tool

This is my thoughts on Activity Diagram diagram(Uml 2.0) for all.
It will give you some initial idea.....:)...(CLICK & DOWNLOAD)

E-R Diagram, At-A-Glance Data Base Represening tool

This is my thoughts(I don't have much experience in database) on Sequence Diagram diagram(Uml 2.0) for all.
I made it in 2008. Hope fully It will give us some idea.....:)...(CLICK & DOWNLOAD)

Sequence Diagram, The Time prospective workflow of a program

This is my thoughts(very small) on Sequence Diagram diagram(Uml 2.0) for all.
I made it in 2008. Hope fully It will help all.....:)...(CLICK & DOWNLOAD)

Use Case Diagram, The Initial Requirement Specification

This is my thoughts on Use Case diagram(Uml 2.0) for all. I made it for my company in 2008. Hope fully It will help all.....:)...(CLICK & DOWNLOAD)