Retirement is the point where a person stops employment completely. A person may also semi-retire and keep some sort of retirement job, out of choicerather than necessity. This usually happens upon reaching a determined age, when physical conditions don't allow the person to work any more (by illness or accident), or even for personal choice (usually in the presence of an adequate pension or personal savings). The retirement with a pension is considered a right of the worker in many societies, and hard ideological, social, cultural and political battles have been fought over whether this is a right. In many western countries this right is mentioned in national constitutions.
ref:
Wikipedia - http://en.wikipedia.org/wiki/Retirement
Taking The Mystery Out Of Retirement Planning - http://www.dol.gov/ebsa/Publications/nearretirement.html
Retirement Planning - http://retireplan.about.com/
5 steps to Retirement Planning - http://www.rediff.com/money/2004/jul/15perfin.htm
Customize your Retirement Plan - http://www.financialexpress.com/news/‘Customisation-is-a-must-for-retirement-planning’/159637/
Relevance of Retirement Planning - http://www.hinduonnet.com/thehindu/biz/2003/08/25/stories/2003082500090200.htm
How to plan for Retirement - http://www.ehow.com/how_543_retirement.html
Plan your Retirement - http://moneycentral.msn.com/retire/planner.aspx