Through-movement refers to the movement passing through on shortest routes from all points to all other points in the layout. The measure of Choice is said to predict through-movement.
Sources Hillier, B., Burdett, R., Peponis, J., Penn, A. (1987), Creating Life: Or, Does Architecture Determine Anything? Architecture et Comportement/Architecture and Behaviour , 3 (3) 233 - 250. pp.237