Background: This study quantifies the number of observations required to reliably assess the operative competence of Core Surgical Trainees (CSTs) in Ireland, using the Supervised Structured Assessment of Operative Performance (SSAOP) tool.
Methods: SSAOPs (April 2016-February 2021) were analysed across a mix of undifferentiated procedures, as well as for three commonly performed general surgery procedures in CST: appendicectomy, abdominal wall hernia repair, and skin/subcutaneous lesion excision. Generalizability and Decision studies determined the number of observations required to achieve dependability indices ≥0.8, appropriate for use in high-stakes assessment.
Results: A total of 2,294 SSAOPs were analysed. Four assessors, each observing 10 cases, can generate scores sufficiently reliable for use in high-stakes assessments. Focusing on a selection of core procedures yields more favourable reliability indices.
Conclusion: Trainers should conduct repeated assessments across a smaller number of procedures to improve reliability. Programs should increase the assessor mix to yield sufficient dependability indices for high-stakes assessment.
Keywords: Assessment; Competency-based education; Performance of operations or procedures; Reliability; Surgery; Technical skill; Workplace-based assessment.
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