Health and Safety Authority (HSA) — Correct Sitting Position at a Desktop Computer. Health and Safety Authority (HSA) — Advice and guidelines for Computer Keyboard Usage. Health and Safety Authority (HSA) — Advice and guidelines for Computer Usage. Health and Safety Authority (HSA) — Tips on Healthy Working Practices. Health and Safety Authority (HSA) — Advice and guidelines for Portable Device Usage. Health and Safety Authority (HSA) - Health and Wellbeing Guidelines When Using a Computer. Health Problems by using computer. Health Problems by using computer. Broadcast Yourself.