controllable

Able to be controlled; subject to regulation or command.

• For instance, such nonweather factors as insects, disease, errors of management, accidents, and other factors may not be considered controllable […]
• A spring-loaded reducing valve, controllable from the cab, admitted h.p. steam to both h.p. and l.p. cylinders whenever necessary, as, for example, on starting; [...].

Any factor that can be controlled.

• The widest variety of marketing research studies focus on the influences of controllables—products, distribution, promotion, and price.