Preregistration: what was planned before the results?

For a reader, the useful starting question is about order: What did the researchers record before the relevant work or analysis, and what did they decide afterward? We are looking for the actual plan and its timing, not awarding a quality badge because the word appears in an abstract.

Two questions in a fictional paper

Suppose an invented report examines printed instructions for assembling a cardboard display. Its advance plan names one comparison: how many finished displays match a specified diagram. The report also discusses which colors participants selected, a question the authors say they explored after seeing the materials.

Mina reads both passages. She writes “planned diagram comparison” beside one and “later color question” beside the other. She does not erase the color discussion, and she does not describe it as part of the original comparison. The categories preserve the report's own sequence.

Then she follows the registration link. The record lists a date, an analysis plan, and a statement about the data already available. Those details matter to her reading note; the existence of a link alone would not have answered when the authors saw or analyzed the relevant information.

An advance-plan reading card

Use this optional card with a report and its linked registration:

• Record: title, registry address, and date actually shown.
• Data timing: what does the record say was already collected or examined?
• Planned question: which result does the report connect to this plan?
• Later work: which analyses are explicitly described as additions?
• Differences: where are changes explained?
• Access limit: what could I not read or establish?

You can stop after locating one planned question. This is a document-reading exercise, not an instruction to register or conduct research on relatives.

Planned does not mean unchangeable

The Center for Open Science explains that unplanned analyses can still be reported and that changes should be made transparent. [1] In the invented display example, the reader's task is therefore to retain the distinction, not assume every later question is forbidden or that every change invalidates the entire paper.

Likewise, do not treat preregistration as a substitute for examining the actual question, methods, findings, and limitations. If those materials are unavailable, write down what remains unknown instead of letting the label fill the gap.

Different roles, one readable timeline

A teen doing a school project can identify which question came first. A partner can help follow the linked record. A parent or grandparent can ask whether a headline is discussing the planned comparison or a later observation. No family member needs to be appointed the final judge of a scientific field to ask those questions.

Source

[1] Center for Open Science. Preregistration. Publication date not stated; accessed September 6, 2026. “What is Preregistration?”, timing guidance, and questions about unplanned analyses and changes support [1]–C2. No registry endorsement, clinical review, or registration service is offered here.

Related guides

• Research protocol
• Hypothesis
• Preprint
• Evidence