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The value of an action parameter can be set in three ways:

• Directly by assigning a value to the parameter - button 

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• Using the expression constructor - button
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• By using robot resources or the results of previously executed actions - button
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The expression constructor is designed to create an expression whose evaluation result will be used as the value assigned to the action parameter. It is recommended to use the expression constructor when the value of the action parameter is computable, i.e. it is calculated based on a certain formula.