Table 2: Analysis of reliability of evaluation data. (α) Crombach’s α; (α (Stand.)) Crombach’s α for standardised data; (Inter-item co-var.) Inter-item co-variation; (Inter-item correl.) Inter-item correlations; (ICC (individual.)) and (ICC (average.)) respectively correlation coefficient in classes of individual and average size, (p) the largest error probability of the specified statistics.