Information technology plays an increasingly important role in the medical working environment. Besides facilitating improvements in the quality of health care, it might also bear some unwished effects. Examining the ‘making’ of a diagnosis and the role it plays in modern medicine leads to the question how far this process of ‘diagnosing’ might be affected by the ‘technical surroundings’. A number of examples from clinical medicine in the hospital and the ambulatory sector illustrate the way IT is being utilised in (...) modern medicine. A twofold negative effect could result from this ‘computerisation’: Firstly, the technical requirements for the use of IT might force the process of diagnosing to be adapted with subsequent wrong or altered diagnoses. Secondly, constraints like cost control might be facilitated by IT and thus its application might cause the doctors trying to avoid such pressures by modifying the diagnosis and potentially worsening treatment and outcome. (shrink)