[MEP]

The definition of "next action" should be eqivalent to what "available" actions is defined as now. That's the GTD definition of "next action". This nonsense about purple highlighting is just a distraction from the real principles of the context-based action list (which makes such distinctions as "sequential" and "parallel" meaningless in the actual moment of choosing what action to do "next"). I just change the styling of all my actions so that they all look the same, and I've found that I get more done.