Part 4 of 6

Scenario-Based CAT (SBCAT) - Theory + Hands-On

⏱️ 20 minutes 1:20 - 1:40

Theory & Design Principles (6 min)

IRT 2PL Model:

P(correct) = 1 / (1 + e^(-a(θ - b)))
Where θ = learner ability, b = item difficulty, a = item discrimination

Key Features:

Efficiency: 40-60% fewer items than fixed-length tests
Precision: Standard error < 0.3 in 8-12 items
Formative: Feedback and hints available during test
Diagnostic: Identifies specific strengths and gaps

Key Innovation: Unlike traditional CAT (no feedback), SBCAT makes assessment a learning opportunity

Hands-On Activity (12 min)

Instructions:

From SPL, click "Assess Mastery with SBCAT"
Complete adaptive assessment (8-12 items)
Observe difficulty adaptation after each response
Request hints if stuck (note: penalty to ability estimate)
Review final diagnostic report

Try Adaptive Assessment

Group Discussion (2 min)

When would you use SBCAT: pre-assessment, formative, summative?
How is SBCAT different from traditional quizzes?

Key Takeaways

SBCAT uses IRT for efficient adaptive testing
Formative feedback supports learning during assessment
Diagnostic reports identify strengths and gaps