Product software implementation method result in ambiguity when questions arise in the execution of the implementation process. On the other hand methods can be used as a profession, meaning that the method should be taken strict and the usage of the method should be a profession, instead of a guiding principle. This view is very useful if the implementation process is very complex and is very dependent on exact and precise acting. Organizational and quality management will embrace this view, as a strict usage of any method results in more clarity on organizational level. Change management however might indicate that more flexibility in an
Rodger's method will be evaluated decided upon prior to collecting the data (planned) or while trying to figure out what those data are trying to reveal ("post hoc"), and 2) does the procedure use a decision-based (i.e., per contrast) error rate or does it instead use an experiment-wise error rate. Rodger’s method, and some others, are classified according to these dimensions in the table below. In early 1990s, one set of researchers made this statement about their decision to use Rodger’s method: “We chose Rodger’s method because it is the most powerful "post hoc" method available for detecting true differences among groups.