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[0] Exam - Oral/vivas [1] Oral communication skills; reasoning behind judgement and actions. [2] May be used to confirm practical/clinical assessments. [4] Online Language Disabilities Support [3] 
May be subjective. Personal factors may influence assessor. Variability in questions asked may mean students face different tests. May be highly stressful for some students.
Good Practice Assessment Guidelines - Policy Directory @ UOW