limit for having the user feel that the system is reacting instantaneously, meaning that no special feedback is necessary except to display the result.” – Jakob Nielsen 1993, Usability Engineering
– protected methods afford overriding – private methods constrain from overriding • Das selbe bei final für Klassen und Methoden – http://ocramius.github.io/blog/when-to-declare-classes-final/ integer_net GmbH 18