Incorrect or missing functions.

perforance errors

incorrect or missing fuction comes in white box
testing.....performance error we r getting in load testing
so my answer is interface error

while Black box testing we find Interface errors.
Incorrect or missing functions - white box testing
Perfomance errors - Performance testing
Interface errors - Black box testing

All the three can be tested in black Box manner as we don't 
need the source code to identify the Missing /incorrect 
functionalities , Interface errors and the performance 
errors

I too agree with the third answer,

blackbox Testing types:
1)usability testing
2)Functional Testing
3)performance testing
4)security testing

I think interface(Usability) and Performance errors come 
under that and not Incorrect or missing function(whitebox 
testing).

I too agree with 3 and 4 answers.Here I am giving you some 
information on functioanl testing,may be you people aware 
of this.

The main intention behind functional testing is to find, is 
there any mismatch between your application behavior with 
respect to customer requirements and also we can figure out 
any functionality is missiing during this testing.So 
that,here we can satisfy the first option i.e  Incorrect or 
missing functions.

We can also find the User interface errors,which we can 
find out by seeying the interface and this would be also 
possible in functional testing.

we can find the Performence errors during performance 
testing only,which is one type of techniques in Blockbox 
Testing.

All the 3 categories

I ahev different thought on this question,
i beleive it will find Incorrect or missing functions and 
Interface errors.

Incorrect or missing functions can be found by black box in 
a way that suppose an add function is missing, when user 
will click on add button it will display an exception on 
server or may be in the GUI, by looking at the logs we can 
see that whether the functiona is missing or not

Please correct me if i am wrong

Black Box Testing means testing the targeted software from 
the point of view of its functionality without having the 
knowledge of its source code.So Incorrect or missing 
functions and Interface errors options are right.In 
Incorrect or missing functions we only check the 
functionality and in Interface checking we also check the 
same thing.
Example of Incorrect or missing functions is Checking the 
Hyperlink.
Example of Interface Errors is Checking the functionality 
of printer means printout of required document is coming 
properly or not.

All the three

Black Box Testing Attempts to find the errors in the
categories like,

. Incorrect Or Missing Functions
. Interface Errors
. Errors in Database or external data Access
. Performance errors
. Initialization and termination