Decent quality paper and an assortment of Pilot Frixion Clicker (erasable) ball point pens in different colors are what I use for hashing stuff out, but even th

Decent quality paper and an assortment of Pilot Frixion Clicker (erasable) ball point pens in different colors are what I use for hashing stuff out, but even then a whiteboard is better for some tasks simply because of it's ephemeral nature.