forcing function

Mathematics, Sciences A function in a system of differential equations that is only a function of time, unaffected by the other variables; or, more generally, any non-homogeneous source function in any variable.

Computing, Engineering, Graphical user interface, Mathematics, Natural sciences, Physical sciences, Sciences An aspect of interface design that restricts a user's abilities in order to streamline completion of a task.

Broadly Any task, activity or event that forces one to take action and produce a result; impetus, impulse.