Moreover, even sub-optimal methods, applied consistently in everyday operations, have often brought about no worse results. A method may be called outdated, a dinosaur, but besides being inexact it may be robust. Such methods often do a better job than methods that are precise, offer safeguards at all ends, but are applicable only if whole sets of prerequisites are met (non-robust). It is important to compare all methods and apply them to the concrete company situation. Frequently, method knowledge that has been gathered in a certain connection will suddenly prove applicable in a very different context, perhaps in modified or expanded form. This has proved to be a source of ideas for innovation and improvement in the management of logistics systems.