The main effort focuses combat power and resources on the vital element of the plan and allows subordinates to make decisions that will support the commander's intent without constantly seeking advice. This way, the commander is successful in achieving his goal and each subordinate ensures his actions support the main effort. It is the focus of all, generally expressed in terms of a particular friendly unit, activity or effect. While each unit is granted the freedom to operate independently, everyone serves the ultimate goal, which unifies their efforts. In certain campaigns, the main effort may be focused on influence activities in the psychological plane, while activities on the physical plane are supporting and may seek only to maintain a secure environment for other elements and forces.