An example system is provided in according with one implementation of the present disclosure. The system includes a first sensor positioned at a storage structure displaying an item, where the first sensor is to capture vibration data in proximity to the item. The system further includes a location analysis engine to perform a location analysis of a user, an identity analysis engine to perform an identity analysis of the user, a user interaction engine to perform an interaction analysis of the user's interaction with the item based on the vibration data from the first sensor, and a collaboration engine to perform a collaboration analysis related to the item based on the location analysis of the user, the identity analysis of the user, and the user interaction analysis with the item.