noun

the use of skill to create or bring about something, especially with a consequent effect of artificiality.

the requirements of the system, by happy chance and some contrivance, can be summed up in an acronym

scheme,stratagem,tactic,manoeuvre,move,course/line of action,plan,ploy,gambit,device,wile,trick,ruse,plot,machination,subterfuge,artifice,expedient,wheeze,lurk,shift,fetch