ScheduleHorizon = sum(j in Jobs, t in Tasks) duration[j, t];@\Vlabel{line:back:opl:horizon}@
Activity task[j in Jobs, t in Tasks] (duration[j,t]);@\Vlabel{line:back:opl:task}@
Activity makespan;@\Vlabel{line:back:opl:makespan}@
UnaryResource tool[Machines];@\Vlabel{line:back:opl:resources}@

minimize makespan.end@\Vlabel{line:back:opl:goal}@
subject to {
	forall (j in Jobs)@\Vlabel{line:back:opl:con2}@
		forall (t in 1..nbTasks-1)
			task[j, t] precedes task[j, t+1];

	forall (j in Jobs) @\Vlabel{line:back:opl:con1}@
		task[j,nbTasks] precedes makespan;

	forall (j in Jobs)@\Vlabel{line:back:opl:con3}@
		forall (t in Tasks)
			task[j, t] requires tool[resource[j, t]];
};