Need I remind you who Einstein is?

In contrast, the multiprocess model (McDaniel & Einstein, 2000) argues that a process as important as prospective memory would have a number of underlying mechanisms. According to this model, the properties of the prospective task, the nature of what you are doing at the time, and a number of other variables will influence whether cue identification is automatic or effortful. Relatedly, it has also been argued that it may be how hard you perceive that it will be to identify the cue that mediates how much effort is used to monitor for it (Hicks, Marsh & Cook, 2005; Marsh, Hicks & Cook, 2005). Recent studies suggest that effortful monitoring is not always required to identify cues (Hicks, Marsh & Cook, 2005, Einstein et al., 2005). This is consistent with the intuitive experience of an intention spontaneously 'popping' to mind (Meier, Zimmermann & Perrig, 2006).