Customization in software industry has become an important aspect of application development. There can be a million software applications available in the market but they are of no use if they do not meet the client's requirements. Customized Application Development allows the client to get exactly what he/she wants in the software. Client being the ultimate user of the software always has the better perspective of the needs. For a good customized application development one has to ensure that the requirement of the client has been understood thoroughly. A precise communication with the client on the requirements of the software becomes essential.