Portfolio Versus Practical Exam for a Laboratory Science

The challenge exam, with both written and practical sections, is the appropriate primary method. The learning outcomes for a microbiology laboratory include psychomotor competencies - aseptic technique, plating, staining, microscopy, safety - that a portfolio of work records and a supervisor letter cannot directly demonstrate. A portfolio can corroborate employment history and expose the student to the evaluator, but it is not sufficient for lab credit by itself. The challenge exam also gives comparable evidence across students and fits the department's existing once-per-term schedule. The student's 15 years of experience is relevant to readiness but not a substitute for current competency, especially after an 18-year gap since formal coursework. The department should map each exam item to a course outcome, use a rubric with a passing standard set in advance, and have two evaluators, at least one of whom teaches the course. The $150 fee should be disclosed before the exam, and the student should receive the outcomes and rubric in advance.

It needs four elements. First, clear alignment: each written and practical task maps to a specific course learning outcome, with the passing threshold stated before the exam. Second, qualified evaluators: a content faculty member and a lab supervisor or second faculty member, with credentials on file. Third, standardized conditions: same equipment, safety briefing, time limits, and rubric for all challenge candidates; reasonable accommodations through the disability office if applicable. Fourth, a complete record: the exam prompt, student work or checklist, evaluator scoring, date, signatures, and the credit recommendation. The practical should include a safety component, and the evaluator should have authority to stop the exam for unsafe practice. The department should also have a retake policy and a written appeal path. This record is what an auditor or a student's appeal will review; a supervisor letter alone would not show that the student can perform the lab safely today.

Failure of the practical means the student has not demonstrated a required outcome, so the department should not award the lab credit. The student should receive the scored rubric and specific deficits, not just a pass/fail notice. If the written section passed but the practical failed, the department may consider separate didactic credit only if the course is structured as separate lecture and lab; it should not convert the lab credit into an elective to avoid the safety issue. The student should be told about the retake policy, any waiting period, remediation options, and the appeal route. If unsafe practice was the reason, the evaluator should document the specific behavior and any safety remediation required before a retake. The department should also check that the failure was not caused by defective equipment or inadequate instructions. Throughout, the standard should be the same one applied to enrolled students in the lab course; athletics eligibility or admission deadlines do not lower it.