Cetin,

The LOCAL is only not necessary if no other code is called from that method. Otherwise the LOCAL is protecting the variable from being changed by some other code that may be called from the method.

Declaring variables LOCAL is a good practise since it allows you to alter the method's code in the future without worrying about whether csoem other mehtod called will try and use the same variable name for some other purpose and therefore over write the value of your Private variable.