Abstract :
[en] Extended Reality (XR) is increasingly adopted in industrial settings, including within the Wal4XR project in Wallonia (Belgium), where deployments must accommodate operational constraints, human variability, and organizational practices. Although XR may support performance and knowledge transfer, field use often involves long sessions, constrained workspaces, repetitive procedures, and heterogeneous operators, conditions under which fatigue, postural discomfort, and attentional overload can limit sustained adoption. Existing research has proposed fatigue/workload modeling and context-aware and adaptive interfaces that adjust interaction based on inferred user state. This position paper suggests that persistent discomfort may also reflect how use is modeled: ergonomic issues frequently develop through gradual dynamics in which operators reorganize posture, pacing, action ordering, movement trajectories, and attention to keep tasks achievable. We frame these processes as situated activity reconfiguration that precede explicit fatigue. Building on the task-activity distinction and accounts of embodied, situated interaction, we argue for modeling context beyond state-at-time-t variables, toward activity trajectories and their progressive adjustments, to better inform ergonomic adaptation in prolonged industrial XR use.
