This study is research into Invisible Chronic Illness (ICI): illness that cannot be seen by another, but that can have a major, sometimes catastrophic, effect on the lives of people concerned, especially their working lives. Each chapter deals, in some detail,with certain aspects of chronic illnesses that cannot be readily seen. The research is argued to be a vital excavation - a recognition of authentic and previously unheard voices and a methodology of primary value in researching the incommensurable, the difficult, the nasty in organisational life / Doctor of Philosophy (PhD)