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Documenting the assembly, maintenance, use, and troubleshooting of a system as complex as a voting system is a difficult task. A single system might combine proprietary hardware, custom operating systems and software, commodity personal computers, and pen and paper. Describing these highly varied components is one function of voting system documentation .But it is not only voting system technology that is heterogeneous; so are voting systems users, and the environments in which the systems are used. Election officials, poll workers, and voters often need guidance from documents in order to administer or use a voting system. In addition, voting system certification—the process by which a system is approved for use in state— demands evidence that a voting system complies with one or more sets of standards or guidelines.
N-Tier Architecture:

The Real Estate Web Application is built using a layered architecture where the total functionality can be divided into layers having different functionalities. The main layers include the database access layer, business layer and the presentation layer. Thus the application follows the n – Tier Architecture. The System Architecture is explained in detail below:

N-tier application architecture provides a model for developers to create a flexible and reusable application by breaking up an application into tier. The n-Tier application has mainly three tiers or layers; they are called:

· Presentation Layer

· Business Logic Layer

· Data Access Layer