In the beginning the main focus was on the individual himself and his problems in adapting to the work environment, but over time the focus changed from the individual himself to the effects the work environment was having on people’s health.
Áherslan var til að byrja með á einstaklinginn sjálfan og vandamál hans við að aðlagast vinnuumhverfinu en með tímanum breyttist áherslan og sjónum var beint að skaðlegum áhrifum vinnuumhverfisins á heilsu fólks.