Research by the European Federation of Public Service Unions (EPSU) found that negative effects currently experienced by workers fall into 3 categories:
Canfu ymchwil gan Ffederasiwn Undebau Gwasanaethau Cyhoeddus Ewrop (EPSU) fod yr effeithiau negyddol a brofir gan weithwyr ar hyn o bryd yn perthyn i dri chategori: