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The system is a simple temperature controller. The basic idea is to set the temperature in an office based on time and working hours.
The case has been originally taken from a textbook by Michael Negnevitsky, Artificial Intelligence. A Guide to Intelligent Systems, 1st ed., Addison-Wesley, 2002.
The case has been the first HeKatE case to be modelled.
It has been described in several papers 
.
See for a full Description.
Concepts: day, today, time, operation, month, season, thermostat_setting.
Relations: day → today, time → operation, month → season, season → thermostat_setting, operation → thermostat_setting.
See for a full Conceptualization.
See for a full Conceptual Design.
See for a full Attribute Specification.
See for a full Prototyping.
See for a full Logical Design.
See for a full Formal Analysis.
See for a full Physical Design.
See for a full Integration.
