1. A computerized method comprising: receiving multiple documents from at least one machine-readable media, the multiple documents having a hierarchical relationship relative to each other and the multiple documents including a first document, wherein a second document of the multiple documents comprises an enhancement to first document, the enhancement being at least one of a replacement of part of the first document or an addition to the first document; and displaying the multiple documents on a display screen such that the multiple documents are arranged according to the hierarchical relationship.