Before the open, many traders glance at overnight range and stop there. Value area width from the prior regular session adds a second dimension: how much price was accepted as fair, and how far initiative moves may need to travel before finding new balance.
A narrow value area often means the prior day spent little time rotating. That can leave unfinished business above or below—especially if the profile shows single prints or thin volume near an extreme. Your open questions become: does price reopen inside that thin zone, or does it gap and force a new auction?
A wide value area suggests prolonged two-sided trade. Opens that occur deep inside a wide value tend to favor rotation until inventory is cleared; opens outside that value invite a different checklist—acceptance versus rejection of the new levels.
In our Misato workshops we practice marking value area high and low without over-labeling every node. The goal is a short pre-open list: location relative to prior value, overnight inventory bias, and one scenario if the first 30 minutes accept outside yesterday’s balance.