Motor skills
Bilateral Coordination
Also called: two-handed coordination, bilateral integration
Bilateral coordination is the ability to use both hands together in different roles — one stabilising while the other acts — as when cutting paper or steadying a page while writing.
It is a prerequisite for cutting, tying laces, and using a ruler. In cutting, the dominant hand opens and closes the scissors while the non-dominant hand continuously rotates the paper; those are two different jobs happening at once, which is why cutting a circle is so much harder than cutting a straight line.
It also underlies handwriting in a way that is easy to miss: the non-writing hand should be anchoring the paper. A child whose page slides around as they write may have a bilateral coordination gap rather than a handwriting one.