For each individual competitor (not country): 3 points for gold, 2 for silver, 1 for bronze in any individual track event (including relays makes it too easy to pick sprinters).
Obvious choices are Farah, Bolt, G. Dibaba.... who else has at least a chance at 6 points? Is there anyone who will be doing more than 2 events with some chance of medals in each?
Many countries haven't yet picked their teams, so we don't actually know who will be in the running.