Othogonal Array Testing to my understanding is not exactly 
a testing type but a technique to reduce the testing effort 
by reducing the Testcases, identifying the repetition of 
pairwise combination.

The Orthogonal Array Testing Strategy (OATS) is a 
systematic, statistical way of testing pair-wise
interactions. It provides representative (uniformly 
distributed) coverage of of all variable pair
combinations. This makes the technique particularly useful 
for integration testing of software
components (especially in OO systems where multiple 
subclasses can be substituted as the server for a
client). It is also quite useful for testing combinations 
of configurable options (such as a web page that
lets the user choose the font style, background color, and 
page layout).

a)	Orthogonal array testing is nothing but that is 90 
degrees testing
b)	That is the when all testing requirements are 
cleared the test is orthogonal array testing.
c)	In all test case are maximum passed
d)	It is very good testing
e)	Here use the test data through the array
f)	So then the application is more quality


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Orthogonal Array is a Testing Design Technique where u can 
give 90% Test Coverage.Here Functionalities are seperated 
into "Factors" and "Levels" and out put will be in the form 
of "Experiments".Its a misunderstandindg that the no of 
Test cases will be reduced always in Orthogonal Array.It's 
not the way always.It gives the effective Experiments/T.C 
to be executed ,some times it may list more no of T.C than 
u identified manually.
Objective:
Reduce COST,REWORK,TIME
Increase Productivity
MAX Test Coverage

In OATS we reduce the test cases by eliminating the 
repeated pair combination still ensuring maximun test 
coverage, this technique is not used for a simple project, 
applied for complex projects when test has to be conducted 
across varios OS, browsers and processors within a limited 
timeframe. We arrive at reduced number of test cases and 
ensure cost effective, efficient results. Instead of 
running all the scripts, we assure that the resulting 
scripts (reduced by applying OATS technique) when executed 
would satisfactority asssure that the product works right.