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Alpha Testing
Alpha Testing is mostly like performing usability testing which is done by the in-house developers who developed the software or testers. Sometimes this Alpha Testing is done by the client or an outsider with the presence of developer and tester. The version release after alpha testing is called Alpha Release.

Beta Testing
Beta Testing is done by limited number of end users before delivery, the change request would be fixed if the user gives feedback or reports defect. The version release after beta testing is called beta Release.

Gamma Testing
Gamma Testing is done when the software is ready for release with specified requirements, this testing is done directly by skipping all the in-house testing activities.

Web Application Testing is done on a website to check its load, performance, Security, Functionality, Interface, compatibility and other usability related issues.

In Web application testing, three phases of testing is done, they are,
Web Tier Testing
In Web tier testing, the browser compatibility of the application will be tested for IE, FireFox and other web browsers.
Middle Tier Testing
In Middle tier testing, the functionality and security issues were tested.
Database Tier Testing
In Database tier testing, the database integrity and the contents of the database were tested and verified.

Use Case Diagrams is an overview graphical representation of the functionality in a system. It is used in the analysis phase of a project to specify the system to be developed.
In Use Case Diagrams the whole system is defined as ACTORS, USE CASES and ASSOCIATIONS, the ACTORS are the external part of the system like users, computer software & hardware, USECASES is the behavior or functionality of the system when these ACTORS perform an action, the ASSOCIATIONS are the line drawn to show the connection between ACTORS and USECASES. One ACTOR can link to many USECASES and one USECASE can link to many ACTORS.

Static Testing
Static Testing is a White Box testing technique where the developers verify or test their code with the help of checklist to find errors in it, this type of testing is done without running the actually developed application or program. Code Reviews, Inspections, Walkthroughs are mostly done in this stage of testing.

Dynamic Testing
Dynamic Testing is done by executing the actual application with valid inputs to check the expected output. Examples of Dynamic Testing methodologies are Unit Testing, Integration Testing, System Testing and Acceptance Testing.
Some differences between Static Testing and Dynamic Testing are,
· Static Testing is more cost effective than Dynamic Testing because Static Testing is done in the initial stage.
· In terms of Statement Coverage, the Static Testing covers more areas than Dynamic Testing in shorter time.
· Static Testing is done before the code deployment where the Dynamic Testing is done after the code deployment.
· Static Testing is done in the Verification stage where the Dynamic Testing is done in the Validation stage.