FAA Fundamentals of Instructing (FOI)The Teaching Process and MethodsHard
A ground instructor is writing a multiple-choice test item and includes one incorrect option that is far longer and more detailed than the correct answer and the other choices. A colleague reviewing the item points out that this flaw could give away the correct answer without testing real knowledge. What principle of effective test item writing has been violated?
- ATest items should avoid absolute terms like 'always' or 'never'
- BDistractors should be grammatically consistent with the stem
- CTest items should have only one unambiguous correct answer
- DDistractors should be homogeneous in content and length
Show answer & explanationAnswer & explanation
Correct answer: D. Distractors should be homogeneous in content and length
Well-written distractors should be similar in length, detail, and grammatical structure to the correct answer so that length or format does not serve as an unintended clue. Making one incorrect option noticeably longer or more detailed violates this homogeneity principle.
Why the other options are wrong
- A. Absolute terms like 'always'/'never' are a separate item-writing flaw, unrelated to option length.
- B. Grammatical consistency refers to matching sentence structure with the stem, not length/detail.
- C. This item can still have one correct answer; the flaw described is about the length of a distractor, not ambiguity.
Distractor Homogeneity in Test Items
A principle of effective test writing stating that all answer choices, including distractors, should be similar in length, format, and level of detail so that no option is unintentionally identifiable as correct or incorrect.
- Distractors must be plausible but incorrect
- Unequal length or detail can act as an unintended clue
- Part of broader item-writing guidance to ensure test validity
Memory trick: PHOA: Plausible, Homogeneous, One correct answer, Avoid absolutes