How to Write the Methods Section of a Research Paper
The Methods section is the most undervalued section of a research paper. Researchers rush through it, assuming it is just a technical formality. But a poorly written Methods section can get your paper rejected — not because the science is wrong, but because reviewers cannot evaluate whether your work is reproducible or valid.
A good Methods section has one job: allow another trained researcher to replicate your study exactly. This guide shows you how to achieve that.
The core principle — reproducibility
Every decision in your Methods section should be guided by one question: could a researcher in another lab reproduce this experiment using only what I have written? If the answer is no, you need more detail.
This does not mean writing a protocol. It means including enough specific, verifiable information that replication is possible in principle.
What to always include
Study design and setting
State the design type (randomised controlled, cross-sectional, prospective, retrospective), the setting (hospital, laboratory, field), and the time period of data collection.
Materials and reagents
Name every chemical with its grade, supplier, and catalogue number where relevant. For biological materials, include source, passage number, and storage conditions.
✅ Correct
Metformin hydrochloride reference standard (purity 99.8%, Sigma-Aldrich, USA, Lot No. BCBP4567) was used throughout the study.
❌ Too vague
Metformin standard was obtained from a commercial supplier.
Equipment and instruments
Include manufacturer, model number, and key settings. For HPLC: column brand/dimensions/particle size, mobile phase composition, flow rate, detection wavelength, injection volume, column temperature.
Sample preparation
Describe every step — weighing, dissolution, filtration, centrifugation, dilution. Include concentrations, volumes, times, and temperatures at each step.
Statistical methods
Name every statistical test used, the software version, and the significance threshold (e.g. p < 0.05). Do not just write "statistical analysis was performed."
Tense and voice
The Methods section is written in past tense — you are describing what you did. Use passive voice where conventional in your field, but do not let passive voice make your sentences ambiguous about who did what.
✅ Clear
Samples were centrifuged at 3,000 rpm for 10 minutes at 4°C. The supernatant was collected and stored at −20°C until analysis.
What to leave out
- Results — these go in the Results section
- Justification for why you chose the method — this belongs in the Introduction or Discussion
- Catalogue numbers for common lab consumables (pipettes, tubes) unless they are critical
- Excessive detail that adds length without aiding reproducibility
💡 Tip
After writing your Methods section, ask a colleague who was not involved in the study to read it. If they have questions about how to replicate a step, that step needs more detail.
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