• minimise muscle tension and allow time for muscle recovery
• regular breaks and stretches
• education of employees
• good working techniques (Tips on using the keybd & mouse)
• minimise stress and high workloads
• ergonomic setup of work area

Regular Breaks & Stretches

• micropauses
• rest breaks (time away from the computer)
• stretches and exercises
• try not to work through lunch or morning & afternoon breaks

Employee education

• good working techniques
• understanding RSI
• how to take micropauses and breaks
• how to do stretches / exercises properly
• early reporting of symptoms

Avoid stress & high workloads

• provide a low stress work environment
• avoid performance based controls if possible
• limit time spent on computer
• provide task variation if possible
• learn relaxation techniques

Good working techniques

• good posture (drop shoulders, lean back, chin in)
• good typing technique
• good mousing technique
• minimise mouse use!

Ergonomic work area

• good chair
• correct positioning of keyboard & screen
• footrest
• forearm rest
• comfortable mouse / mouse rest
• plenty of room for mouse
• copy holder

Tips on using the Keyboard

• use a forearm rest - but don't glue your wrists to it
• smooth, even, rhythmical movements
• press keys softly
• pretend your wrists are in a straightjacket
• move hands from the shoulder
• learn touch typing

Tips on using the Mouse

• slow it down
• cup it in your hand gently, don't GRIP it
• clean mouse regularly
• move from the shoulder, keep wrist locked
• rest fingers on buttons - don't hold above
• avoid using it, or chuck it away altogether! There are plenty of better alternatives

Detailed advice on using the mouse is available here.