“…Naturally, for developers of expert systems (a member of the 'hard' AI class), the medical domain was an attractive field of practical application and several developed systems achieved measurable successes: MYCIN (Shortliffe, 1974), INTERNIST (Myers & Pople, 1977), PUFF (Kunz et al, 1978), and VM (Fagan, 1978), to name a few. The major breakthrough of these expert systems, particularly of MYCIN, was their representation of uncertainty in medical decision-making (Pollitzer & Jenkins, 1985) and their ability to somewhat mimic the processes used by medical professionals in dealing with this uncertainty. Concepts such as fuzzy logic, similar in some ways to quantum logic, yet less general in scope (Schmitt et al, 2009), have also proven effective in expert systems applications to overcome the incomplete and vague information often provided by patients (Prihatini & Putra, 2012).…”