The other part is the policy element. That part of the plan sets forth the community's long-range objectives and the policies by which it intends to achieve them. The policy element of each community's plan is adopted by ordinance and has the force of law. Local plans may be changed through plan amendments or periodic review. Plan amendments are smaller, unscheduled adjustments to a plan.
Periodic reviews are broad evaluations of an entire plan that occur every four to ten years.
A plan may be modified extensively after such a review. Each plan is accompanied by a set of implementing measures. There are many different kinds. The two most common measures are zoning and land-division ordinances. Every city and county in Oregon has adopted such land-use controls.