Munros and Corrbetts

'Munros and Corbetts' are the names of classification schemes of scottish mountains based on the heights/separations of mountains.

Munros
Munros are over 3000ft (914.4m) - and 'sufficent' seperation from other peaks. What 'sufficient seperation' actually means, has been debated much over the years - but at least 30 minutes walking between Munros, is a good guide. Munros are named after Sir Hugh Munro, who cataloged all the hills for the Scottish Mountaineering Club in 1891. Originally there were 274 Munros. But as surveying has become more acurate, the current list stands at 284 Munros and 511 tops and is from the 1997 revision.

Corbetts
Corbetts, have a more formal defination than Munros - those hills of height between 2500ft (762m) and 3000ft (914.4m) with a drop of at least 500ft (152.4m) between each listed hill and any adjacent higher one. - they were listed/climbed by John Rooke Corbett in the last century between the two world wars. He accomplished this after becomming only the second person to climb all the Munros and Tops in 1930.
There are presently 219 Corbetts.

This information is taken from the Scottish Mountaineering Clubs Website- The full text can be found here.