Introduction to Requirement Engineering

REQUIREMENT ENGINEERING(RE)

Why RE?

Why RE in SysE?
Software Lifecycle and Error Propagation 

What is RE?

How to do RE? 

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WHY??????WHY????WHY??????

Why RE IN System Engineering:-

A system (from Latin systēma, in turn from Greek σύστημα systēma, "whole compounded of several parts or members", literary "composition") is a set of interacting or interdependent components forming an integrated whole.

A system is a set of elements (often called ‘components’ instead)

and relationships which are different from relationships of the set or its

elements to other elements or sets.

Most systems share common characteristics, including:

• structure, defined by components/elements and their composition;

• behavior, which involves inputs, processing and outputs of material, energy, information, or data;

• interconnectivity: the various parts of a system have functional as well as structural relationships to each other.

• some functions or groups of functions.

The term system may also refer to a set of rules that governs structure and/or behavior.

System Engineering=Engineering System

Engineering is the discipline, art, skill and profession of acquiring and applying scientific, mathematical, economic, social, and practical knowledge, in order to design and build structures, machines, devices, systems, materials and processes.

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Requirements Engineering is raising and answering questions: 
Why do we need a System?
What should a system be like?
How do we go about building a System?
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SOFTWARE LIFE CYCLE FLOWCHART:-

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"ERROR PROPAGATION LIFECYCLE:-H

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“The definition of insanity is doing the same thing over and over again and expecting a different result. "

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