5The hard call
Week four. The instructor replies that the practical is timed because speed is part of laboratory competence: reactions have to be run within a window, the room is booked for three hours, and a different day means a different practical.
- Essential Requirements and the Limits of Flexibility — the most demanding judgement in the field: when flexibility preserves what is being measured, and when it alters it.
- Accommodated Exams and Assessment Logistics — changing the conditions of an assessment without changing what it measures; how an accommodation carries into a laboratory exam; what the research on extended time does and does not show; what happens when a person’s health fails during the exam itself.
- Reasoning Through an Accommodation Request — invented cases worked from first contact to a recorded decision, and the record each decision leaves: what is written down, what is kept out, who may see it.
- Access in Studio, Shop and Lab-Based Learning — protecting the safety requirements that are genuine while examining the ones that are only habit.
- Eliminating Construct-Irrelevant Barriers in Assessment — the validity principle underneath all of it: a result should reflect capability, not incidental obstacles.
The advisor does not decide what chemistry requires, and does not accept the instructor’s first answer either. Validity belongs to the interpretation of a score, not to the test itself (source 10), so the question is what the practical’s score is taken to mean. Put in plain words, as Meiorin asks it: which parts of the practical are timed because the chemistry is timed, and which because the room is booked? Asked that way, the instructor separates them. Two of the six tasks are time-critical; a reaction has to be quenched inside a short window or the result is meaningless. The three-hour total is the booking. The first is a bona fide requirement of the standard; the second is construct-irrelevant variance, a feature of the test that affects the score without being part of what is measured (sources 1, 11).
The decision follows the line that answer draws. The two time-critical tasks keep the pace the chemistry sets, for every learner. The session as a whole is extended by the ratio already in Rowan’s letter, and that ratio is itself examined rather than inherited: a pan-Canadian study found the common 150 per cent allowance usually set at intake from policy or custom rather than from evidence about the person (source 15), and the research on extended time supports individual decisions over standing formulas (source 14). A deferred sitting is arranged in advance in case a difficult stretch falls on the day, with a stated rule for who calls it and by when. The record carries the reasoning: what was essential, how that was established and by whom, what was offered, and what was declined and why. A decision reasoned this way is an argument that links the performance to the inference drawn from it (source 12).
Where practice disagreesWhether a deferred practical is still the same assessment. Comparability across conditions of administration is something to be argued, not asserted: the deferred sitting samples the same content, sets the same tasks at the same pace, and is no easier or harder (sources 10, 13). This path holds that a practical meeting those conditions is the same assessment, and the record says so in those terms. What remains is effort. Effort can choose between two accommodations that both work; it cannot defeat the only one that does, short of undue hardship (source 5), and effort is a question for the sixth stop.