Estimate your real retirement needs.

FORBES: Five Steps Toward Fixing the Hole In Your Retirement Plan

Ask them to be brutally honest about what needs to be fixed, and to estimate the cost of repairs.

WSJ: Are Sellers' Appraisals and Inspections Overkill?--WSJ House Talk

To estimate the latter, one needs to know what fraction of the impactor was distributed globally, as opposed to being ejected to space or landing close to the crater.

BBC: Dinosaur-killing space rock 'was a comet'

Many economists estimate that the U.S. needs to add about 150, 000 each month just to keep up with population growth.

WSJ: Economy Adds 157,000 Jobs

Sir Alan says that many schools under or over-estimate the number of pupils with special needs, and that this leads to an incorrect level of provision for these pupils.

BBC: School action urged on behaviour

According to CNN's latest estimate, Romney has secured 569 delegates and needs 575 more to reach the 1, 144 required to clinch the GOP nomination.

CNN: Romney gets two big, but not high-impact, endorsements

The 160 turbines on the windfarm will be capable of generating 576MW of power, and the developers estimate that it will produce the energy equivalent to the annual needs of about 400, 000 homes.

BBC: £19m Gwynt y Môr wind farm cash for north Wales over 25 years

Economists at Lombard Street Research estimate that in order to meet its 1.5% deficit target, Italy needs to grow by 2.5% next year.

ECONOMIST: Italy��s economy