Key points
- You do not need “all evidence.” You need enough evidence to justify a decision.
- Start at the highest appropriate synthesis level, then go down only if necessary.
- Define a stop-rule before you search: what would be “good enough” today?
The evidence stack (simple version)
Think in layers: (1) synthesis (systematic reviews, high-level summaries), (2) key primary studies, (3) background/explanatory material. Time-poor clinicians should spend most of their time at layer 1.
A stop-rule that actually works
1
Step 1 — Decide what kind of answer you need
Is this a “what is true?” question (evidence) or a “what should I do?” question (decision under constraints)? Your stop-rule differs.
2
Step 2 — Choose your minimum acceptable evidence
Example stop-rule: “one high-quality synthesis + one confirmatory primary study,” or “two independent reputable summaries that agree.”
3
Step 3 — Stop when marginal returns collapse
If the next 3 sources repeat the same conclusion without adding new data, you are done for today.
This is how you stay current without burning out
A consistent “good enough” process beats sporadic deep-dives. Your system should be sustainable at 20% energy.
SourceOxford CEBM: How evidence levels map to different question types
Open Link Save your place and choose what comes next
Work through this guide (3 steps)
Use the actions from this article to track what you have worked through.
Sign in using the reading controls above to save your steps.
Is this a “what is true?” question (evidence) or a “what should I do?” question (decision under constraints)? Your stop-rule differs.
Return to this sectionExample stop-rule: “one high-quality synthesis + one confirmatory primary study,” or “two independent reputable summaries that agree.”
Return to this sectionIf the next 3 sources repeat the same conclusion without adding new data, you are done for today.
Return to this section
Low-energy study · Article 1 of 1