An example collaboration system is provided in according with one implementation of the present disclosure. The system includes a 3D display a 3D data visualization, at least two hand avatars of two different users, and a view field avatar. The system also includes a plurality of auxiliary computing devices and a behavior analysis engine to perform a behavior analysis of a user. The behavior analysis engine is to: determine an attention engagement level of the user, and determine a pose of the user in relation to the auxiliary computing device. The system further includes an intention analysis engine to determine an intention of the user in relation to the 3D visualization based on the user's attention engagement level and the user's pose, and a collaboration engine to implement an action with the 3D data visualization by using a hand avatar based on the user's intention and an identified gesture.