Hello: I am trying to separate responsabilities in 3 clases. A Class Person whith atributes weigth and height, a constructor, setters and getters, and a method that calculates the BMI (Body Mass Index). A class PersonForm whith a text field for weigth, another for heigth, another for BMI, and a buttom Calculate. I have a PersonControler that listener when the user press the buttom, send the weigth and the height to the class Person, retrieave the BMI and send the value to the text field. What is the correct place to validate that the text fields not were empty and the weigth and the height were numbers >0? (sorry for my english). Thank's. Ana María
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