In mobile and multi-channel information system, the geographical location and context of the user when performing some task may be important for the design of IT applications. Yet, mainstream process models seldom capture the "where" aspect, such as the location for performing some activity. In previous papers we have performed an initial analytical evaluation and two controlled experiments comparing some notation alternatives. For all these notation alternatives the underlying assumption has been that they should be achieved as fairly small adaptations of existing process notations, using UML Activity Diagrams as an example. In this paper we provide a more comprehensive analysis of the problems, using 9 principles for visual notations proposed by Moody, and considering clean-sheet design of a process notation in addition to minor adaptations of existing ones. The paper demonstrates how this would result in quite different notations, each with their pros and cons.