Requirement:
A condition or a capability needed by a user to solve a 
problem or achieve an objective that must be met or 
possessed by a system or system component to satisfy a 
contract,standard,specification, or other formally imposed 
document.

Specification:
A document that specifies, ideally in a complete,precise 
and verifiable manner, the requirements, design, behaviour, 
or other characteristics of a component or system, and 
often,the procedures for determining whether these 
provisions have been satisfied.


In very simple language

Requirement is nothing but the raw data gathered from the 
customer what he wants whereas Specification is a document, 
which explains cutomers needs and what system should do and 
how it should work, the points which are not specified in 
requirement,the architecture of the syatem and so on..

Requirement is a bases upto the paper work but 
specification describes the functionality interms to the 
system work .
Regards,
koteswara.9.rao@gmail.com

Requirment about athe projects are collected from the  
customer 

Specification  will be checked by the test lead ,ie 
checking the project whether developer have  developed the 
coding  as per the customer need or not

Requirement(BRS):- 
     BRS- business requirements specification. Business
analyst will interact with the client and will form BRS
document, 
  It contains

   1.scope of the project
   2.business rules
   3.client requirements in depth.

Initially client will give the req's in their own format
then it will be converted in to Standard format( which we
call as Specification) by which s/w people can understand.

In BRS the req's are defined in general format. where as in
SRS ,the req's will be divided in to modules and each module
contains How many interfaces and screens it can have.




SRS:-

 Based on BRS system analyst will form SRS document, 
   it contains

  1. System requirements along with hardware requirements
  2. Functionality to be developed and
  3. what is input
  4. what is output
  5. what is front end
  6. what is back end
  7. what are the technologies
  8. what r processes how they will interact.

based on sRS document design will be generated.


SRS is a Software /System Requirement specification,it is a
MS word doc. which defines the complete business
functionalities of the particular application
SRS designed by System Anallyst

 HOpe it might give ur answer.

As per the client requirement  the test case are written 

but specification can be developed by tester, they have to 
fullfill the needs of the client in such way they have to 
develop the code as well as without bugs