In this requirement engineering example we take an example and try to deifube different levels of requirement engineering, now consider follwing statement of example

“Develop a find and replace function to inetgrate in ssytem”

Now first define different level of requirement

Business Requirement

From the statement, the business requirement is we want develop a find and replace feature that Integrate in the ssytem and extend system functionality.









User requirement

From user requirement point of view, find and replace first find a particular word one time or many time and then allow user to replace a word or replace all the same words from document.

Functional requirement

From statement finctional requirement is that find and replace function shows a dialog to enter word and three to four buttons to porvide different function like find,replace,replace all and close buttons and perform desire function.

Non-Functional requirement

In following example non functional requirement is that find and replace function is impleemned in existing word processing system that runs on windows operating system.

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