The final stage of creating a marketing plan is to decide the controls that will be put in place to measure the success of your efforts. If you don’t know which activities have worked, you won’t be able to repeat them and build on your success.
Establish measures for success, and timescales for measuring each activity. Make sure they are realistic and that you don’t try to assess the effect of your campaign too early.
You may also want to look at your achievement against overall objectives. This is best done at regular intervals (perhaps every three months). This way, if things aren’t going quite to plan, you will have time to reassess the situation and perhaps amend future activity so that you can get back on target.