Cognitive decline progresses from the mild cognitive impairment stage and proceeds into various dementia types and progresses through different severities. During the course of the cognitive decline the patient is subjected to actions and decision making as provided by respective professional groups. Coordination of various clinical and care giving skills and capacities involve information management and reasoning which require consideration of different logic platforms suited for the professional groups. Particularly at early detection it is important to adapt information and knowledge representation to situations where cognitive problems are encountered and by whom these observations are made. The very first observations of cognitive decline are usually made by thepatient's husband/wife and relatives Advice is then sought from social authorities, nurses and primary care doctors within their local health care centres. Professional representation in these groups will not perform final diagnosis but rather provide necessary background information for assessment and initialization of thediagnostic procedures. Moving between logic representations of guidelines requires formalism as provided by general logics.