Table 3.

Variance components from partially crossed generalisability study

Component and their interaction	Explanation of interactions	Variance components	%
Student	The variance in marks due to true differences in the capability of the student	17.18	11.28
Task	The consistent tendency for one task to be marked higher or lower than others	17.81	11.70
Assessor	The tendency for one assessor to score a task highly and another to score the same task poorly	21.13	13.88
Assessor with student	The varying views that assessors have of students capability	5.60	3.68
Assessor with task	The tendency for an assessor to mark a task higher or lower in addition to their usual stringency/leniency	16.10	10.58
Student with task	The tendency for the student to engage with one task and not another	74.42	48.88
Residual error	Residual variation not explained by other factors	0.00	0.00