EXSYS Professional Developer Interface

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Variables Variables contain numeric data. A variable value may be any value between its upper and lower bounds. For the purposes of building the tree, the value of the variable is divided into numeric ranges defined by the logical break points in the decision making process. CHOICES Choices are the goals that the expert system will decide among. A system to identify types of flowers would have the various species of flower as choices. A system to determine the cause for a failure in a machine would have the possible items that could break as choices. Depending on the Confidence Mode used, a choice may be assigned a confidence value to determine its relative likelihood. Choices can be used in the THEN part of branches only. Take a very small example identifying items on the desk: YES Makes noise? NO Color? Black White Black Flat T E L E P H O N E C O M P U T E R FLOPPY DISK P A P E R P E N C I L C y l i n d r i c a l When converted to RuleBook form this will look like: Makes Noise: YES Makes Noise: NO Color? Shape White Color: Black Color: White Color: Black Color: White It is easy to draw a tree on paper. It is just as easy to draw a tree in RuleBook once the editing commands are learned. BALLOONS RuleBook automatically converts each branch of the tree to an IF-THEN rule. To see the rule that is associated 8 • THE <strong>EXSYS</strong> DEVELOPER OVERVIEW Telephone Computer Floppy Disk Shape: Flat Shape: Cylindrical with any branch, click on a node. A balloon will be displayed showing the rule up to that node. For example, a click on the box labeled Computer would display: Color: Black Color: Color: Black Color: ADDING NODES TO A TREE When a new tree is created, it will only have a terminal node that says "Double Click to Add Factor". Paper Pencil Telephone Computer Floppy Disk Shape: Flat Shape: Cylindrical Tree Name Double Click to Add Factor IF Makes Noise: YES and Color: Black THEN Computer Paper Pencil ▲ ▼ To add a factor to the tree, double click on the terminal node. This will bring up a dialog box for adding factors.
Qualifier Select qualifier by text or name: Find Find Again The color of the flower is The stem is The size of the flower is The leaves are Red White Yellow Orange Blue Green Other Values: Individual New Qual. OK Group All Together Custom Cancel A qualifier condition for the color of a flower, could be added by clicking on the TEXT button in the Add IF Factor box. This would display a dialog box with all of the qualifiers. In this case the statement that "The color of the flower is Red" has been selected. This will be added to the tree. The color of the flower is red The color of the flower is white The color of the flower is yellow The color of the flower is orange The color of the flower is blue The color of the flower is green Control for grouping other values Double Click to Add Factor Double Click to Add Factor Double Click to Add Factor Double Click to Add Factor Double Click to Add Factor Double Click to Add Factor The node that was added takes into account all possible answers that the end user may provide for the qualifier. The value we selected, "The color of the flower is red", is in the top line, but branches were automatically created for the other possible answers. The result is six branches each with a terminal node. In this way, RuleBook automatically creates branches and guarantees that the tree will be c o m p l e t e . Having RuleBook generate branches also helps to extract information from the system developer. It forces the developer to consider all possible cases. When the RuleBook Expert function checks the trees, it will report any branches that have not been completed. In some cases, it is not desirable to add a separate branch for each of the other possible values of the qualifier. RuleBook provides three options. At the bottom of the dialog where the qualifier and value was selected is a set of radio buttons that control how the other values are grouped: In the example, the default of "Individual" was selected. This causes each of the other values to be given an individual branch. The second option is "Group ALL Together". This causes all of the other values to be put in a single branch. If this had been selected, the tree would look like: The color of the flower is red The color of the flower is white OR yellow OR orange OR blue OR green Double Click to Add Factor Double Click to Add Factor There would only be two branches from the node. The third option is to do custom grouping of the other values. This provides custom control for the number of branches created and what values are associated with them. Selecting the "Custom" option displays the dialog: Group Values in Group: 1 2 New Delete OK Cancel Add to Group Add All Delete from Group Values in Group: THE <strong>EXSYS</strong> DEVELOPER OVERVIEW • 9
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Page 19 and 20: For example, suppose a system uses
Page 21 and 22: SCREEN TEMPLATES Custom screen temp
Page 23 and 24: Interfaces Expert systems are power
Page 25 and 26: any legal EXSYS Professional expres
Page 27 and 28: In addition to calling the program,

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