h2g2 The Hitchhiker's Guide to the Galaxy: Earth Edition

Pyscologists have calculated that it takes 10 items of praise to balance one item of criticism so be careful what you say. When javing to give someone criticism also make a note of the good points before having ot give the constructive criticism and also don't criticise all the points that need improving at once deal with the major issues first the minor ones can be dealt with at a later date if you have continual access to the other person.