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Tham khảo tài liệu 'expert systems for human materials and automation part 14', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Expert System for Automatic Analysis of Results of Network Simulation 381 respectively from the right-side of the rule. Derived facts now have equal rights as in the reasoning process Siler Buckley 2007 Krishnamoorthy Rajeev 1996 . A backwarddecision uses deductive execution. Deduction is a form of reasoning that proceeds from general principles or premises and derives the particular information. The main goal of backward-decision is oriented towards rejecting or confirming the truth of the goalhypotheses. Hypothesis can be for example water level is high . Firstly the mechanism checks if it is possible to confirm the goal-hypothesis using a fact in the operational memory otherwise it looks for a rule which can confirm the hypothesis Siler Buckley 2007 Krishnamoorthy Rajeev 1996 . Usually systems with backward-decisions are more efficient in comparison to forward-decision systems because they reduce search space and quickly find a proper solution. Such systems can be used when in advance-defined trivial goals exists. 2.3 User interface The expert system user interface takes care for a comfortable communication between the system and unskillful users. It provides an insight view into the problem solving process carried out by inference. The user interface translates the information given by the user in a form suitable for computer manipulation decisions and interpretations made by the system and present them to the user in an intelligible written textual or graphical form. User interface usually allows interaction with the environment and other systems as external databases are for example. The most commonly used expert system user interfaces are in the form of questions and answers menus hypertext natural language graphical interfaces etc. The user interface is one of the most critical elements in the whole expert system because a bad user interface can lead to limited or ineffective use. Furthermore user interface design is generally more demanding than the .
