hi, priya. whenever buisness requirements comes from client
side or say client requirement comes the developers prepare
use cases based upon that requirement. if there is enough
time  the testers made a document called test scenarios
(that are made from that use cases which cover the paths)but
if testers dont have enough time then they directly start
preaoring test cases. But let me clear u that it is not
necessary to prepare test cases before test scenarios . Its
depend upon time that is required from  client side. hope u
got ur answer...
  do correct me if m wrong anywhere......

hi guys,i wanna make small modifications to the answer given
by Nemade.When ever tester gets requirements he will read
those and start writing scenarios first.Each scenario is the
method by which perticular feature in the application can be
tested.in this way tester will write different scenarios by
which that perticular feature in the application can be
tested.Now,by considering those scenarious tester will write
all possible testcases for each scenario.

So writing scenarious is mandatory before starting writing
test cases.

Test case : is a document that consists of 
the following 
:Testcase Id , testcase name , testcase desciption , 
prioroty ,reproducable,Steps ,description ,Expected ,Actual 
,result 
Test case nothing detailed desscription of the each and 
every step to validate the expected value 

Test Scenario 
test scenario is a format which gives the information or 
flow of application .i.e it is like story 
ex: 
sc1: login screen:login screen consists of username , 
password , 
sc2 :if username and password is correct login in to 
application 
sc3: if username and password does not match display a 
message 
by seeing testscenarios only we will write testcases

Before you write any testcase will first off all prepare 
the test secnario.

Make it Simple.

Test Case are put in an Exceutable Order,this is called 
test procedure or test Scenario.

Group of test Scenario Docu Designed to Cover a test 
Condition will form a Test Case.(pls note this is not the 
definition for test case).

so test scenario and then Test case.

hi divya nice ans

hi prince ,
  

you mensioned that "Group of test Scenario Docu Designed to 
Cover a test Condition will form a Test Case.(pls note this 
is not the definition for test case)." are u sure this is 
correct.

I think it will be group of test cases which will make a 
test scenario.

Test scenario is nothing but it is a  group of related test 
cases .

hi sijo,

         Your are absolutly correct.

hi reema, 

         R u a TE.

Testcase is nothing but, process of data flow or 
combination of related work we can prepare test scenario. 
then let we know how to prepare different kind of negative 
test cases. 

if it is wrong, please give me proper example and meaning 
to this.

Identifying the TestScenarios is mandatory, with out the 
Scenarios writing the testCases is confusion, So only few 
Organizations will directly write the testcases, without 
the Scenarios.

Test scearios is a high level test case..
Where as testcase describes step by step process how we 
validate application functionality

Test Scenario is basically dervied from Highlevel design 
document, FRS and Storyboard,
and Test cases are written by refering Test Scenario,

The purpose of writting the Test Scenario is whether 
perticulr usecase/Req is testable or not

Test Scenario is not mandatory part but it should be made 
as it makes easy to start working on Test Cases further.
Moreover what Divya explains about Test Scenarios & Test 
Cases is Absolutely right

TC

After reading & understanding the SRS/UC we hve to prepare 
test scenarios & develop Testcases based on some techniqs 
like BVA,ECP....