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We'll create a new class named Main Dimensions, in which the following ship parameters are to be stored.

•     Lpp: Length between perpendiculars
  
  
•     B: Moulded breadth
  
  
•     T: Draught from keel to Construction Water Line
  
   In the Knowledge browser  Top Goals/Undefined and select new Class (Ctrl+N). Provide the class with the name Main Dimensions. Note that the input box will already contain the word "Goals". To make a new class, delete Goals and write your class name (in this case Main Dimensions). Sub classes can be defined by adding the main class with sub classes separated by points: Goals.Sub goal

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The class is now shown in the knowledgebase tree, and we can add the parameters Lpp, B and T.

 Select the class Main Dimensions.  in the right-hand side of the knowledge browser, and select New Parameter/Function(Ctrl+I), see figure 3. Note that the last parameter in focus will be shown in the input field (most probably QKnowledgebaseVersion). Delete this parameter, type Lpp and click the Value button. Repeat these actions for the parameters B and T.

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   Add the following relation to the class Main Dimensions:

which defines the displacement of the ship in tons

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Let's perform our first Quaestor calculation. A solution is always determined by one or more Top Goals. A top goal is a parameter (or object) that is your final calculation target, in this tutorial it's the displacement of the ship. 

   Select the class Main Dimensions in the knowledge browser. Double click the parameter DISP.

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