“…The studies lack an adequate description of how HFS refinements should be assessed. Existing HFS assessment tools are insufficient, which was emphasised in 28 studies [ 49 , 55 , 58 , 61 , 64 , 65 , 68 , 71 , 75 , 78 , 80 , 81 , 84 , 85 , 87 , 89 , 95 , 96 , 98 , 99 , 103 , 107 , 111 – 115 ]. Assessment methods ( n = 51) spanned quantitative, qualitative and mixed methods, validated and non-validated methods, rating behavioural markers, rating via checklists, interviews, self-assessments, passing probes of information, measuring time and evaluation of reported experiences.…”