Abstract: The present invention generally relates to prosthetic socket accommodation systems. In some embodiments a prosthetic socket accommodation system may be configured to automatically adjust the accommodation system in response to user activities. In some embodiments, a controller of the prosthetic socket accommodation system may be customized for a prosthetics user based on an activity volume profile of the prosthetics user. The activity volume profile may correspond to a residual limb fluid volume response to prosthetics user activity. In some embodiments, a controller of a socket accommodation system may be configured to control pistoning during prosthetic socket use. Some embodiments are related to sensors for identifying prosthetics user activity. In some embodiments a three-axis sensor may be used to identify prosthetics user activity. In some embodiments a socket proximity sensor comprising an infrared sensor may be used to detect socket donning and doffing by the prosthetics user.