The Plan History allows the user to see all changes and modifications made to a plan.Each modification to a plan will result in a new Revision of the plan (note: in a complex plan there may be hundreds of revisions). If the user is not satisfied with the results of a modification they may go back to any of the previous Revisions and make that instance the active instance. (note: this will cause another Revision to be created) Below is a walk through and explanation of each step.

1. Open the General block from the Plan Overview
2. Expand the History tree node. The number of plan revisions will be listed. In this below example there are 36 revisions
3. Select the More Details option in the bottom right hand corner
4. The summary of the latest revisions will expand to the right
5. The user should then pick the revision they want to look at by selecting the blue show. This will expand that particular version of the plan and explain what was done
   1. “op”: is the operation performed in this version that differs from the previous version (i.e. delete: an item was deleted)
   2. “path”: is the item in the treatment plan data that had the operation performed
   3. “val”: is the value in the path that had the operation performed
6. If the user would like to return to this version they may do so by selecting the blue make active
7. The use can close the expanded version by selecting the blue hide