Even we dont have knowledge on particular application,we 
can test the application using black box testing.By 
creating test plan,testcase and executing the testcase by 
giving valid and invalid inputs we can test the application.

In real scenario it will not happen .without knowing what u 
will test. u dont know what to test so first study CRS,SRS 
or FS and then write testcases. and take aproval from u r 
lead.and then test u r application.as a proffesional test 
engr i dont suggest any one to test without any knowledge. 
if u go for testing without any knowledge then u dont 
complete u r testing.

I will agree with Manjunath's answer. First if anything 
need to be tested ask of SRS Document of that or Get 
explained of What to be Tested. Otherwise, you will be 
Testing and Finding Cosmetic Errors (If exists) that too 
partially.

without knowing any thing about application we cant take 
next step.atleast we have to know  some overview of abut 
that application and we will do testing

If you dont know anything about the application the 
word "Testing" doesn't have any meaning. So before testing 
the application go thru the related document or get a 
download about the functionality from the respective 
person. It will help to understand the functionlality and u 
will know what is going to be tested.

If u don't have any Knowledge on perticular application we 
can go for Exploratory Testing. 

We can explore the application and test the application 
Parallel.

Exploratory testing means one will testing the application 
with out any prior document support.

adhoc testing ,

without knowing about application testing is not possible, 
because by reading BRS,SRS,Function specifications/use 
cases only we impliments test cases and executes tests. If 
there is no information about application at least we must 
find from our test lead whether it is related to any other 
application and then we can proceed by gathering details 
from experts or other sources then only we will tests that 
application. Application means the customer should submit 
details and his expectations on that soft ware. so i think 
it is not come in to picture maximum.

If u dont have any knowledge on perticular application but
they give that application to u for Testing , then in my 
opinion u can test the application by designing the 
specific kind of test case. Because we know that a tester 
can design their test cae for the testing of application 
and the design of test case can be done in three ways
 1)Business logic based Test case design
 2)Requirement based Test case design
 3)User interface based Test case design
Here the Test case design is applicable  "user interface 
based test case design "
Then design test cases first then write test case 
accordinly 
then execute those test cases ,find bug ,analyse it .....

Hi veda
  For functional testing ,application knowledge is 
neccessary so explore the app well, go thro requirements 
then proceed with automation functional testing

Hi Ramesh
1st of all it has not been Given in the question that you 
have to go for functional testing only . 

2nd point is They will give the application to you , from 
any application a tester can get some brief idea about the 
aim of the application and that is must. (what i am saying 
that is most practicable).But according to theory you are 
correct.

This practice is very common generally for simple to 
understand projects where you are asked to test a product 
with out any documentation.

Now you have to find a way to learn the application such as 
Exploring the application(Exploratory Testing) and than 
documenting the application behaviour you understand and 
and getting your findings reviewed/corrected by stake 
holders and this way you will have requirement document and 
product knowledge.

Thanks,
Raj

Indeed this comes under Exploratoroy testing, Here T.E doest
have functional knowledge, and has't desing any T.C.D. with
out this directly an application is going to be released,
low level companies are going to follow this.

while seeing the particular functionality i.e ADD button he
comes to know that this is an add function, and he is going
to test on it.

so here knowing the functionality and testing the
functionality happens simultaniously.

Try to understand the domain/application by going through
with BRS,SRS,USE CASES you will get all the required 
information to undestand particular domain/application
still if you are not clear or you got some issues go
for review meetings there you can clarify any thing that
you dont understand

Try to do monkey testing and find out the wrong 
functionalities.

Hi,
This is valid question,why this type of questions are 
asking in the software industry bcz they want to check the 
ability of the testing person,whether he/she can do the 
testing without any document,just providing an application.

Yes: If you don't have any knowledge on perticular 
application but If somebody is assigned you to test the 
application.
Follow the steps:
1.First Go to the help & then check the functionality as 
per the option provided in the application.(help is the 
mandatory option for all the application)
2.Understand complete functionality of the application 
3.If you have any doubt regarding the application ,pls ask 
to your seniors & get the knowledge about application
4.Then start testing the application.