; Shiel et al.) The WHIM is designed to assess and monitor all stages of recovery from coma ABSTRACT. Specifically, to determine whether the trajectory of change predicts outcome status, and whether the current hierarchical order of WHIM items is correct for this context The Wessex Head Injury Matrix (WHIM; Shiel et al.,) is a behavioural observational assessment tool commonly used for the assessment of patients in and emerging from a coma and patients in the PDOC. The Wessex Head Injury Matrix