You can use the Collection Manager to change the content model for all objects in a collection that use that model. This allows you to, for example, upgrade all the audio files in a collection from an existing Islandora content model to a new Solution Pack version of the content model.
1. Navigate to a collection and open the Collection Manager.
Choose a collection and click the 'Manage This Collection' tab at the top.
![](/download/attachments/31659993/2011-10-19_add_collection_01.png?version=1&modificationDate=1320793214513&api=v2)
2. Change the content model for all related collection objects.
Expand the 'Change Content Models' section and choose a content model to be changed. Then choose the new content model to replace it.
![](/download/attachments/31659993/2011-10-19_15-change_content_model_01.png?version=1&modificationDate=1320793214453&api=v2)
Click 'Change Content Model Associations' to complete the operation.
You have successfully changed the content models of all related objects in the collection.