Table of Specifications (TOS): Build Valid Tests That Match What You Taught
A Table of Specifications maps test items to the competencies taught, allocating item counts proportionally to instructional time and distributing them across cognitive levels — producing a test that is valid by design and defensible when questioned.
Why the TOS exists
Without a TOS, tests drift toward what is easy to ask rather than what was taught — over-testing trivia, under-testing the competencies that consumed your instructional weeks. The TOS forces proportionality before a single item is written, which is why schools require it for summative assessments.
Building one in five steps
- List the competencies covered in the assessment period.
- Record instructional time (sessions) spent per competency.
- Allocate items proportionally: (sessions for the competency ÷ total sessions) × total items.
- Distribute each competency's items across cognitive levels — remembering through creating — matching the competency verbs.
- Assign item placement numbers so the test assembles directly from the table.
Cognitive balance without pretension
The competency verb sets the ceiling: a competency asking learners to “differentiate” needs analysis-level items, not just recall. A healthy classroom test still includes accessible lower-level items — balance, not uniform difficulty, is the goal.
The TOS as a defense document
When a grade is questioned, the chain runs: class record → test paper → TOS → competencies taught. A complete chain closes disputes quickly — and a well-made TOS filed with your test papers doubles as RPMS assessment evidence.
Frequently asked questions
Is a TOS required for all tests?
Schools typically require TOS for major summative tests like quarterly exams; short quizzes may not need one, though alignment principles still apply.
What format should the TOS follow?
Use your school's or division's prescribed template where one exists; the essential columns are competencies, time spent, item allocation, cognitive levels, and item placement.
How many items should a quarterly test have?
Item counts follow your school's testing guidelines and available time; the TOS then distributes whatever total is set.