IT-SC in Microsoft Office Include QR Code 2d barcode in Microsoft Office IT-SC Visual Studio .NET ANSI/AIM Code 39

IT-SC generate, create none none on none projectscode 39 generating c# environment unto itself. If none for none systems are built with traditional assumptions, architects and developers are likely to spend most of their time combating the distributed nature of realworld applications. Problems and challenges of distributed computing have nothing to do fundamentally with business-application functionality.

The purpose of information technology is to establish new business processes. By separating concerns, we can focus on the business functionality that is the true purpose of the information system. Ideally, architects would like to separate distributed-system issues into categories of design, where the majority of components are purchasable as commodity communication infrastructure.

Object-oriented architects also need the ability to future-proof the information systems that they are planning. It is important to accommodate commercial technology evolution, which we know is accelerating and beginning to provide substantial challenges for architects and developers. Future-proofing also requires the ability to adapt to new user requirements, since requirements do change frequently and account for a majority of system software cost over the life cycle.

It is important to plan information systems to support the likely and inevitable changes that users will require in order to conduct business. A third need for object-oriented architects is the ability to increase the likelihood of system success. Corporate developers to date have had a very poor track record of creating successful systems.

The object-oriented architect is responsible for planning systems with the maximum probability of delivering success and key benefits for the business. Through proper information technology planning, we believe that it is possible to increase the likelihood of system delivery on time and on budget. In confronting these three needs, authorities in software engineering and computer science tend to agree that architecture is the key to system success.

Authorities in areas ranging from academia to commercial industry are declaring that software architecture is essential to the success and management of information systems. There is a long and growing list of software authorities who have come to this conclusion. Unfortunately, it is not always clear to everyone what software architecture truly is.

In order to provide clarification, we need to take a look at some of the reference models which provide definitions of software and systems architecture (Figure 1.3)..

QR Code 2D Barcode Figure 1.3. Software-Intensive Systems Architecture Reference Models IT-SC The needs that we are discu ssing have been thoroughly considered by many authorities. There are two leading meta-architecture frameworks that guide the development of software system architecture. One of the popular frameworks originated at IBM and is called the Zachman Framework.

The Zachman Framework predated the popularity of object orientation and took the perspective of separating data from process. In the Zachman Framework there are six information system viewpoints as well as five levels of design abstraction. The original Zachman Framework published in 1987 contained viewpoints for the network, the data, and the process of the information system [Zachman 97].

A subsequent revision introduced three additional viewpoints. The current framework resembles the set of traditional journalistic questions, which include who, what, when, why, where, and how. Each viewpoint in the Zachman Framework answers a chief set of questions to ensure that a complete system engineering architecture is created.

The Zachman Framework formed a matrix of architecture descriptions which are also organized in terms of levels. There are five levels of description above the information system implementation. They range from architectural planning done by individual programmers at the finest grain to the overall enterprise requirements from the investors" perspective of the information system.

In total, the Zachman Framework identifies 30 architectural specifications, which provide a complete description of the information system. In practice no real-world project is capable of creating these 30 or more detailed plans and keeping them all in synchronization. When the Zachman Framework is applied, systems architects partition the viewpoint into various categories and create architectural specifications that cover all of the different Zachman descriptions without having to create the large number of specification documents that the Zachman Framework implies.

One example is a very successful architecture initiative by the United States Department of Defense called the C4ISR architecture framework, where C4ISR stands for Command and Control, Computers, Communication, Intelligence Surveillance, and Reconnaissance. The C4ISR architecture framework is used to describe DOD information technology at the highest echelons of the organization. The primary benefit in this case is that different.

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