1.2.14—Model limitations
- Syllabus
- First assessment 2026
- Objective
- 1.2.14
- Level
- SL
Critique the Assumption, Not Just the Accuracy
A model gains usability by simplifying reality, but each omitted detail or assumption creates approximation and uncertainty that may affect the answer.
Name the simplification, then predict its effect. A constant-fertility assumption matters if fertility changes; usefulness depends on fit to the question, not perfect accuracy.
Two population models differ because one assumes fertility stays constant and the other lets it fall; their projections diverge for a reason.
Identify the uncertainty and decide whether it is acceptable for this question and decision.
A useful model need not be perfectly accurate; critique its assumptions and purpose.