What is Sequential testing?
Sequential testing is a method of using a screening assessment (sequence 1), which all candidates attempt.
Candidates who have not achieved a clear pass at sequence 1 are required to sit a second assessment containing different stations (sequence 2). These results are combined with sequence 1 and this gives a larger number of stations to assess the candidates on. The candidates are required to achieve the pass mark (sum of all the individual station cut scores) plus 1 SEm to pass the summative OSCE.
The 2015/16 academic year was the first time sequential testing had been introduced in Liverpool. The OSCE reliability for both sequences was 0.78 with only a small number of students failing both sequences which was less than previous years sitting the traditional resit assessment.
Why the move to Sequential testing?
The OSCE format has been shown to be both reliable and valid. The traditional method of assessment has candidates who fail the OSCE receiving short term remediation, which shows improved performance for the resit attempt. However these candidates do not appear to retain this level of remediation and continue to be around or below the borderline performance levels required to pass.