Complex processes have become more common and include, for example, knowledge workers i.e. people who work with more complex and problematic tasks. The authors' interest is to better understand how a problematic and complex situation in an organization should be model. Four major process oriented modeling techniques has been analyzed using Moody's quality criterion for what makes a good model. The findings indicate that there is only one candidate, BPMN, that meets some of Moody's quality criterion, but there are also weaknesses in BPMN, such as for the criterions; expressiveness and emphasis.