Match the two main forms of action on sustainability (in the left column) with their descriptions (in the right column). Drag and drop application. Preventive maintenance Preventive maintenance drop zone empty. Developmental maintenance Developmental maintenance drop zone empty. Involves action to sustain the status quo, to keep new working practices operating as desired, to achieve predetermined targets and objectives Involves continuing to adapt the changes to local circumstances to sustain an improvement trajectory, to exceed expectation, to achieve higher targets