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Edit: Just realised this was posted in the wrong forum! I guess the Mods will move it to either "AutoIt General Help and Support" or "AutoIt Technical Discussion". Do you use type checking? Or do you choose not to type check? I was trying to think of the simplest way to do a type check without typing arguments more than once and I came up with: Func displayPerson($firstName, $lastName, $age) ; -- TYPE CHECK -- Local $typeCheck = ("" _ & IsString($firstName) _ & IsString($lastName) _ & IsNumber($age) _ ) If (StringInStr($typeCheck, "0")) Then MsgBox(16, "Type Error: displayPerson()", $typeCheck) ; -- FUNCTION -- MsgBox(0, "", $firstName & " " & $lastName & " (" & $age & ")") EndFunc The only catch with this method is that it produces a very simplistic error message. Even still, the fact that you only have to type out arguments once makes it a reasonable approach, in my opinion. The same logic can also be used for making function contracts (for example: $firstName mustn't be an empty string etc...). What do you think? How do you go about such things?