For resource production rooms, you want dwellers with high stats corresponding to that room's primary S.P.E.C.I.A.L. attribute. For Power Generators, prioritize Strength (S). For Diners, prioritize Agility (A). For Water Treatment Plants, prioritize Perception (P). While other stats aren't as critical for production, a higher Luck (L) stat can increase the chance of a critical hit during production, yielding bonus resources and Caps. Train these dwellers in their respective training rooms to maximize their efficiency. A fully maxed S.P.E.C.I.A.L. dweller in their assigned room will produce resources at the fastest possible rate.
