Describe V Model with the entry criteria of each Test Phase.
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Answer Posted / vijay rao
CUSTOMER S/W RELEASED TO CLIENT
| ^
v |
CRS ------------- Review CRS -------------> ACCEPTENCE T'ING
| write ACCEPTENCE test plan(ATP) ^
| write ACCEPTENCE test case(ATC) |
v |
SRS ------------- Review SRS against CRS---> SYSTEM TESTING
| write SYSTEM test plan(STP) ^
| write SYSTEM test case(STC) |
v |
HLD ------------- Review HLD -----------> INTERGRAION T'ING
| write INTEGRATION test plan(ITP)^
| write INTEGRATION test case(ITC)|
v |
LLD ------------- Review LLD -----------> FUNCTIONAL T'ING
| write FUNCTIONAL test plan(FTP) ^
| write FUNCTIONAL test case(FTC) |
v |
CODING----------------------------------> UNIT TESTING OR
WHITE BOX TESTING
(DEVELOPMENT TEAM) (TESTING TEAM)
Hence it looks like V we call it V model or V-V model also.
CRS -- CUSTOMER REQUIRMENT SPECIFICATION
SRS -- SOFTWARE REQUIRMENT SPECIFICATION
HLD -- HIGH LEVEL DESIGN
LLD -- LOW LEVEL DESIGN
BA -- Business Analyst
WBT -- White Box Testing
BBT -- Black Box Testing
I wl explain you in brief how it works with advantages and
disadvantages in simple language.
Left hand side of the model is taken care by Dev, and other
half by Testers. we also call it Verification and
Validation model.
1st phase - When BA collects the CRS from client,it is
given to Dev team and as well as to testing team. Dev
starts developing the SRS where as testing team review the
crs and mean time they start writing ATP,ATC...
If testers come up with any mistakes in crs say
a) Conflict in requirment
b) Missing requirment
c) Wrong requirment
These bugs is communicated to Dev and it is clarified with
BA and client once again.. once the changes is made to crs,
it is again send to testing team.. Dev will make sutiable
modifications in SRS hence they already started developing
it. The same procedure continues untill Testing Team (TT)
approves it.
2nd phase - By that time Dev are ready with SRS, they give
it to TT and they start developing the HLD.
Testers review SRS against CRS and find the bugs,if any, it
is send to Dev, they fix it and resend it to testers, they
make modifications in HLD. Procedure continues untill SRS
is bug free,they write STP,STC.
3rd phase - Similarly as 2nd
4th phase - once coding is ready, developers perform Unit
testing or WBT, where they test each and every line of code.
Types are -> Path Testing
-> Condition Testing
-> Loop Testing
-> Memory Testing
-> Performance Testing
Remaining FT,IT,ST,AP are called BBT done by testers.
Advantages are :--
a) Testing starts from initial stage of development and
every stages are tested.
b) Tesing the Requirment avoids downward flow of defects
C) Deliverables are parallel and simultaneous,so project
will complete in lesser time
d) Total investment is less
E) Requirment changes are handled easily and efficiently.
Dis advantages are :--
a) The model involves lot of documentation work
b) Intitial investment is more
We can go for this model:
a) Long term projects
b) complex projects
c) high quality prodcut within sitpulated time frame
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