Check out the recruitment section of the Dompost today
interesting and affirming article re a best-practice approach to performance management.
If you are a manager of people it would be a good one to scan and send to all staff to reinforce the message.
It also stresses the need for partnership and ownership by staff of their performance by tracking achievements as they go along – along the lines of what I suggest to my clients re documenting your own achievements in your role in case others miss them when judging your performance
This way performance is specific, balanced and timely and not coloured by the most recent event at time of appraisal