Aplha Testing: Simulated or actual operational testing at 
an in-house site not otherwise involved with the software 
developers.

Beta Testing
Operational testing at a site not otherwise involved with 
the software developers.

Ans: Alpha Testing: Testing software in the developer site 
by the customer after 80% - 90% completion of developing 
the application.
Beta Testing:  Testing the application in the customer site 
by the end users before release the product in to 
production.

alpha testing:

it is a kind of user acceptance test  performed at the 
development site by the test engineers in the presence of 
customer

Beta testing:

is is also king of user acceptance test performed at the 
client site with the Beta testers

Alpha testing :When the project is said to be in completion 
it is said to alpha testing .Minor changes  can be made at 
the end of this testing .It is done in  front of 
developers , tester 
Beta testing 
when the project is tested in user side ...its called beta 
testing ..

alpha testing is conduscted by the client at the developers 
site

Beta testing is conducted at the customer site by the end 
user of deliverd software product

Alpha testing is the software prototype stage when the 
software is first able to run. It will not have all the 
intended functionality, but it will have core functions and 
will be able to accept inputs and generate outputs. An 
alpha test usually takes place in the developer's offices 
on a separate system.

The software has reached "beta" stage when it is operating 
with most of its functionality, and is ready for user 
feedback.

Beta tests enable the software to be tested in customer 
environments, giving users the opportunity to exercise the 
software, find errors, and correct them before a product is 
released. For beta test, the software is delivered to 
customers' sites, along with instructions on what features 
to exercise in the software. The developer records, tracks, 
and addresses reported bugs.

alpha testing is nothing but testing of application by user 
at developer site,under the monitoring of developer.


beta testing is nothing but testing of application by user 
at user site, without monitoring of developer.

Alpha testing is being done by both enduser and the developer.
Beta testing is done by the end user.Developer is not
present there.

nitin9360@yahoo.com

alpha testing is the testing has to be done in the lab
(developper).
beta testing is the testing has to be done at user site