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Who Needs Web Applications and Why?

There are many entities that require applications for the Web-one example would be Business-to-Business interaction. Many companies in the world today demand to do business with each other over secure and private networks. This process is becoming increasingly popular with a lot of overseas companies who outsource projects to each other. From the simple process of transferring funds into a bank account, to deploying a large scale Web services network that updates pricing information globally, the adoption of a Web applications infrastructure is vital for many businesses.




The Web Application Model

The Web application model, like many software development models, is constructed upon 3 tiers: User Services, Business Services and Data Services. This model breaks an application into a network of consumers and suppliers of services.

The User Service tier creates a visual gateway for the consumer to interact with the application. This can range from basic HTML and DHTML to complex COM components and Java applets.

The user services then grab business logic and procedures from the Business Services. This tier can range from Web scripting in ASP/PHP/JSP to server side programming such as TCL, CORBA and PERL, that allows the user to perform complex actions through a Web interface.

The final tier is the Data Service layer. Data services store, retrieve and update information at a high level. Databases, file systems, and writeable media are all examples of Data storage and retrieval devices. For Web applications, however, databases are most practical. Databases allow developers to store, retrieve, add to, and update categorical information in a systematic and organized fashion.


 
The Typical Phases in a Web Application Project


Envisioning the nature and direction of the project


In this phase, the management and developers assigned to the project come together and establish the goals that the solution must achieve. This includes recognizing the limitations that are placed on the project, scheduling, and versioning of the application. By the end of this phase, there should be clear documentation on what the application will achieve.

 

Devising the plan

In this phase, you and your team must determine the "how's" of the application.

What scripting language is most appropriate, which features must be included, and how long will it take? These are some of the questions that must be answered through this planning phase. The main tangents at this point are the project plan and functional specification. The project plan determines a timeframe of events and tasks, while the functional specification outlines in detail how the application will function and flow.


Development

Once the project plan and functional specification are ready, a baseline is set for the development work to begin. The programmer/s or Web developer/s begin coding, testing and publishing data. This phase establishes the data variables, entities and coding procedures that will be used throughout the remainder of the project. A milestone document is prepared by the development team, which is then handed to management for review.


Testing, support and stability


The stability phase of the application project mainly focuses on testing and the removal of bugs, discrepancies and network issues that may otherwise cause the application to fail. It is here that policies and procedures are established for a successful support system.


 
 
Knowing Your Options and Using them Wisely
 


Windows Web Servers

Microsoft has built a loyal customer base on one important factor - their easy-to-use software. Windows NT/2000/XP Web servers are very fast and easy to administer. The fact that the operating system is a Windows shell means that administrators and authors can easily allow the Web server to interact with other software and hardware applications to transmit and receive data over the Internet. Popular server side scripting languages used with Windows servers are ASP/ASP. net, Java Server Pages, and PHP.


UNIX/Linux Web Servers

UNIX has long been known for its reliability. It is a powerful and robust Web server and operating system. Unix is the server of choice for many large-scale Websites that need content management systems or receive an extremely high volume of traffic. Popular server side scripting languages for UNIX are Java Server Pages, PERL, PHP, and CORBA

Every scripting language has its pros and cons. As I'm not writing a book here, I'll use the ASP model as my language of illustration. When working with Windows servers, there are several important parameters that the developer needs to throw into the equation, including security, scalability, speed and application design. So below I'm going to help you formulate a successful plan to accomplish all kinds of Web projects.


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