How distractors are built

Each Insporta question has three wrong options, and each must be plausible to someone who half-knows the topic and unambiguously false to someone who knows it. A distractor is never an invented rule, never an absolute the key does not carry, never a simple negation of the key, and never obviously nonsense. The three wrong answers do as much of the measuring as the right one, which is why they are checked as carefully.

What a distractor is for

A question with one plausible option and three implausible ones is not a four-option question. A learner who can rule out the nonsense is left choosing between one or two candidates, and the score no longer reflects whether they knew the answer. The distractors carry the difficulty: they are the alternatives a partly informed learner would actually consider.

So the standard for a wrong option has two halves. Plausible to the half-informed: it uses the vocabulary of the sport correctly, it fits the situation, and it is something a learner who has heard about the topic might believe. False to the informed: someone who knows the rule or the mechanism can reject it without hesitation, and it is checked as false during the fact check, not merely as different from the key, see Fact-checking and quality gates.

The quietly true distractor

The most common finding in a fact check is a distractor that is true. In the first triathlon batch of one hundred questions, the fact check found eleven problems, and most of them were wrong options that were in fact correct: the rule allowed what the option said it forbade. A true distractor gives the question two defensible answers, and a learner who chose the one not keyed was right and marked wrong.

It also damages the question later. When enough learners have answered, each question’s statistics are examined to see whether it separates those who know the sport from those who do not, and a question with two true options fails for a reason that has nothing to do with the learners. The fact check therefore verifies all four options. The version to watch for is a distractor that is true because another question in the same batch teaches it: the author has just written the fact that makes it true.

No invented rules

A wrong option is never made wrong by inventing a Law, a referee behaviour or an administrative restriction. “Cannot be done more than once per half.” “Not permitted by most federations.” “The marker would be flagged offside.” “Contractually obliged to press high.” Keys are never written that way, so the whole class of option can be discarded without knowing the sport, and a learner who has taken a few tests learns to discard it. In a pilot batch of one hundred football questions, 36 contained an invented rule of this kind.

The same applies to invented numbers. If no Law limits how often a goalkeeper may be changed or how many defenders may stand on the goal line at a corner, a distractor that says one does is not a wrong answer; it is a tell.

Absolutes belong in the key or nowhere

“Always”, “never”, “only”, “guaranteed”, “in every case”. If a distractor carries one of these and the key hedges, the absolute marks the wrong option as wrong, and the learner learns to pick the hedged answer. The same pilot had 31 questions with this pattern. An absolute is allowed in a distractor when the key makes a claim of the same strength, so that neither can be identified by its wording.

Not the key negated

“Is offside” against “is not offside” is one fact asked with a flip. Building a distractor by negating the key produces a two-option question with two decoys, unless the distinction between the two is exactly what the question is testing. When a mechanism can be asked from both sides, only one side is a new question; the other belongs to the counter, the precondition or the cost, see No question twice.

Real misconceptions over invented nonsense

The best distractor is something people actually believe. That exertional heat stroke shows as hot, dry skin, when the athlete is usually still sweating heavily. That drafting in triathlon is only riding directly behind someone, when riding alongside is drafting too because the zone has width. That a goalkeeper may hold the ball for six seconds, which was the rule until 2025. Each of these is a wrong answer a learner might choose, and choosing it teaches them something in the explanation. An invented nonsense option is not a wrong answer anyone would pick, so a question that carries one effectively has three options.

No combined options

“All of the above”, “none of the above” and “both A and B” are not used. Each distractor is wrong on its own, and the question asks one thing. Distractors also stay within the length corridor of the key, see Reading load and length; when a batch needs its lengths rebalanced it is a distractor that is extended, and the extended distractor is re-read as a new one.

Why this is a measurement rule

Every tell described here is a way to score without knowledge. Remove them and what is left is the construct described in What a question may measure: a learner who knows the sport chooses the key, and a learner who does not is drawn to the option that matches what they wrongly believe. That is the condition under which a score means what Insporta says it means, and under which a question can later be calibrated as described in How to validate a sports knowledge test.