Software Engineering Process

A Layered Technology

Software Engineering is the establishment and use of sound engineering principles in order to obtain economically software that is reliable and works efficiently on real machines.

The various layers are

tools
methods
process
a quality focus

Software Engineering asks the following questions

What is the problem to be solved?
what are the characteristics of the entity that is used to solve the problem?
How will the entity and the solution will be realized?
How will the entity be constructed?
What approach will be used to uncover the errors that were made in the design and construction of the entity?
How will the entity be supported over the long term, when corrections,adaptations and enhancements are requested by users of the entity?

The Software Process

Software Engineering Institute has developed a comprehensive model that is predicated on a set of software engineering capabilities that should be present as an organization reaches different levels of process maturity. It is called the Capability Maturity Model.it has five process maturity levels, which are defined in the following manner:

Level 1 : Initial
Level 2 : Repeatable
Level 3 : Defined
Level 4 : Managed
Level 5 : Optimizing

Software Process Models

The Linear Sequential Model
The Prototyping Model
The RAD Model

Evolutionary Software Process Model

The Incremental Model
The Spiral Model
The Component Assembly Model
The Concurrent Development Model

The Formal Methods Model

Fourth Generation Techniques

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Unified Modeling Language- (UML)

Brief Background UML is a language for specifying,visualizing ,documenting and constructing the artifacts of software systems,as well as for business modeling and other non-software systems. UML has been developed by Grady Booch, James Rumbaugh and Ivar Jacobson. Goals of UML are : To model systems using Object oriented concepts. To establish an explicit coupling to conceptual as well as executable artifacts To address the issues of scale inherent in complex , mission critical systems. To create a modeling language that can be used by humans as well as machines. Understanding the thirteen diagrams of UML 2.x is an important part of understanding OO development. Although there is far more to modeling than just the UML the reality is the UML defines the standard modeling artifacts when it comes to object technology. There are three classifications of UML diagrams: Behavior diagrams . A type of diagram that depicts behavioral features of a ...

Javascript to validate Email Expression

Using regular expressions is probably the best way. Here's an example ( live demo ): function validateEmail ( email ) { var re = /^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/ i ; return re . test ( email ); } But keep in mind that one should not rely only upon JavaScript validation. JavaScript can easily be disabled. This should be validated on the server side as well.

Local Area Networks LAN

Why use a LAN? The two basic reasons for developing a LAN are information sharing and resource sharing. Information sharing refers to business needs that require users to access the same data files ,exchange emails or search the internet for information. Resource sharing refers to one computer sharing a hardware device (for e.g a printer) or software package with other computers on the network. The main benefit of resource sharing is cost savings, while the main benefit of information sharing is improved decision making. image courtesy Cray Networks Dedicated Server versus Peer-to-Peer Networks A dedicated server LAN has one computer that acts as the network server. It can connect with almost any other network,handle very large databases and use sophisticated LAN software. Moreover,high -end dedicated server LANs can be interconnected easily to form enterprise wide networks or in some cases replace the host mainframe central computer. Four common types of dedi...

Information Technology

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