Problem Frame Diagram: Simple Information Display This is an idealised form of a simple information system (Display Machine) that maintains a continuous display of information (Information Display) about an autonomous causal Real World. The requirement (Display Rules) stipulates the state S4 of the display for each state S2 of the real world. The display is a reactive causal domain, changing its states S4 in response to the machine-controlled phenomena C3. The basic frame concern is the use of t

Problem Frame Diagram: Simple Information Display This is an idealised form of a simple information system (Display Machine) that maintains a continuous display of information (Information Display) about an autonomous causal Real World. The requirement (Display Rules) stipulates the state S4 of the display for each state S2 of the real world. The display is a reactive causal domain, changing its states S4 in response to the machine-controlled phenomena C3. The basic frame concern is the use of t

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