Key idea
Identify the decision and its constraints before selecting a theory or formula.
Read for facts before looking for formulas
On the first pass, underline the resources, constraints, alternatives and requested decision. On the second, separate facts from assumptions. Do not invent monetary costs or institutional priorities that the prompt never gives.
State the core question in one sentence. Only then choose the applicable concept, such as opportunity cost in economics or a mechanism in biology.
Use a five-part answer
A robust response has five parts: relevant facts, issue, rule or concept, application and qualified conclusion. This makes it easier to distinguish understanding from a lucky answer.
Weak answer: 'Choose A because it serves more students.' Stronger answer: 'A produces more math sessions but gives up nine chemistry sessions; without a stated priority, the count alone does not establish the better social outcome.'
Worked economics case: opportunity cost
A university tutoring center has one indivisible six-hour block. Option A provides 12 individual math tutoring sessions (two per hour). Option B provides nine chemistry sessions (1.5 per hour). Both are mutually exclusive, with constant productivity assumed. If the center chooses A, what is the opportunity cost?
The best forgone alternative is B: nine chemistry sessions. Subtracting 12−9=3 mixes outputs of different services and does not measure what was sacrificed. Choosing A may serve more sessions, but welfare depends on priorities and relative value not specified here.
Score your reasoning with a manual rubric
Check four criteria: did you identify mutually exclusive choices, name the forgone alternative with units, justify the economic concept, and state the limits of the conclusion? One point per criterion is a study aid, not an instructor-issued grade.
Try a variation: four hours, A at two math sessions per hour and B at 1.5 chemistry sessions per hour. Outputs are eight and six respectively; choosing A gives up six chemistry sessions, not two.
Practice transfer using your course material
Change one assumption at a time and answer without notes. Classify errors as interpretation, theory selection, units or justification. This is more useful than memorizing a single model response.
You can upload a PDF or DOCX to Evaluo to review concepts and practice by topic. This guide's open-ended rubric is manual: it does not promise automated essay scoring or step-by-step numerical case solving.
Try it yourself
Practice case: a four-hour tutoring block
A offers two math sessions per hour; B offers 1.5 chemistry sessions per hour. The center has four hours and can choose only one.
- 1A produces 4×2=8 math sessions.
- 2B produces 4×1.5=6 chemistry sessions.
- 3If A is chosen, the opportunity cost is six forgone chemistry sessions.
- 4Determining which choice is preferable requires information about institutional priorities and relative value.
How to check your work
The difference 8−6=2 is not the opportunity cost. State the forgone alternative and its units.
Common mistakes
Subtracting unlike outputs
The difference between math and chemistry sessions is not the value of the best forgone alternative.
Assuming more sessions always means better
Relative value and institutional objectives are not supplied in the case.
Giving a conclusion without reasoning
Explain the relevant facts, principle, application and limits.
Frequently asked questions
How do I practice without an official answer key?
Use a course-aligned rubric, state assumptions and verify each step against reliable readings.
Does Evaluo automatically grade my case response?
No automatic free-text grading is promised. The rubric here is for manual self-assessment.
Sources and further reading
References on learning strategies. The original activities in this guide are educational examples and should be checked against your course materials.