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CORE DESIGN <br />The very core of enQuesta is designed based on a standard, three -layer, principle: Isolating <br />presentation, business, and data logic to provide both a solid foundation and adaptable flexibility. <br />enQuesta is a browser -based system. The user interface takes extensive advantage of available <br />front-end technologies such as DHTML (Dynamic HTML), CSS (Cascading Style Sheets), and AJAX <br />(Asynchronous JavaScript and XML), which deliver a rich, customizable desktop application look and <br />feel in a web browser container. By developing the user interface with these emerging technologies, <br />enQuesta is able to quickly respond to user interactions, making selected trips to the server for <br />updated information in the background, reducing wait -time in the enQuesta user's daily workflow. <br />This intelligent use of standards -based web code is setting the stage for the next phase of en,Questa <br />front-end development. <br />The business layer consists of a collection of core application components which are written <br />to leverage the right technology for the right job. Because aspects of Service Oriented <br />Architecture (SOA) are incorporated into the design, enQuesta's architecture lends itself for <br />extension, providing a very high level of enterprise integration. <br />The database rounds out the design at the data layer, providing all of the expected industry - <br />standard RDMBS data access and design tools. To further extend the RDBMS, enQuesta <br />leverages the "enQuesta Query Layer" (eQL) to provide easy access from third party query <br />tools. <br />The enQuesta Query Layer, or eQL, supplies the user with a tightly integrated and user <br />friendly interface using simple and logical naming conventions. It consolidates all reporting <br />objects into a single enQuesta database schema. IDatabase tables and data elements with <br />complex and meaningless inames, are turned into database views and synonyms with <br />meaningful and user-friendlly names. With only read -access to the database information, <br />the eQL also provides an additional level of security for the database. <br />BELOW IS A HIGH-LEVEL SCHEMATIC OF THE OVERALL ENQUESTA APPLICATION ARCHITECTURE.'! <br />12 <br />