How to Write a Scientific Paper: Steps & Structure

To write a scientific paper, researchers organize their empirical investigation into the standard IMRAD format: Introduction, Methods, Results, and Discussion. A successful manuscript establishes a clear research question, presents transparent and reproducible methodology, reports findings with statistical precision, and contextualizes conclusions against published evidence without exceeding what the data support.

Publishing peer-reviewed empirical research requires clear adherence to international reporting standards. Whether preparing an initial submission or formatting a manuscript for a specialized journal, understanding the rhetorical architecture of each section streamlines the writing process and ensures that findings withstand editorial and peer review scrutiny.

Purpose of the Section

The standard architectural structure of a scientific paper is not an arbitrary editorial hurdle. As noted in the International Committee of Medical Journal Editors (ICMJE) recommendations, the Introduction, Methods, Results, and Discussion (IMRAD) framework directly reflects the logic of scientific discovery and empirical verification. Each section serves a distinct functional purpose for both the author and the audience:

Introduction: Clarifies the broader scientific context, reviews foundational literature, identifies the precise gap in existing knowledge, and states the formal research objective or hypothesis.
Methods: Documents the study design, participant or specimen sampling criteria, experimental materials, analytical protocols, and statistical frameworks so that an independent researcher can reproduce the findings.
Results: Presents the raw and analyzed data in a structured, objective sequence using text, summary tables, and visualizations, avoiding editorial commentary or speculative interpretation.
Discussion: Interprets what the results mean, explains how they resolve the initial hypothesis, evaluates alignment with prior literature, and articulates broader scientific or clinical implications.

Mastering scientific writing requires distinguishing between reading order and drafting sequence. Readers consume a paper from front to back—starting with the title, abstract, and introduction before examining the figures and conclusions. In contrast, experienced authors rarely write in this sequence. Drafting begins with the visual displays (tables and figures) and the methods, proceeds to the results and introduction, and concludes with the discussion, abstract, and title.

For related guidance on foundational composition and framing earlier research, see our guides on academic writing and structuring a background section.

Structure (Ordered List)

A complete scientific manuscript contains eight standard components arranged in a strict sequence:

Title Page and Metadata: A descriptive title that clearly identifies the core variables, intervention, or phenomenon investigated, along with the study design when mandated by reporting standards. Includes author names, institutional affiliations, ORCID identifiers, and complete contact details for the designated corresponding author.
Structured Abstract and Keywords: A standalone 150 to 250 word synthesis presenting the background, objective, primary methods, key numeric results with uncertainty metrics, and core conclusions. Followed by 4 to 6 specific keywords. Detailed structural requirements are covered in our guide to APA abstract formatting.
Introduction: Structured from broad background to narrow hypothesis, guiding the reader through what is known, what remains unresolved, and how the current study directly addresses that void.
Methods: A chronological or modular description of protocols, ethical oversight, sample selection, equipment specifications (including manufacturer name and model), measurement techniques, and statistical tests. Detailed sub-structuring conventions are outlined in our overview of APA methods section structure.
Results: An orderly narrative of findings organized logically around primary and secondary outcomes, cross-referenced with numbered figures and tables. Numeric values are presented with exact sample sizes, percentages, effect sizes, and confidence intervals.
Discussion: A synthesis that opens with a direct answer to the research objective, contextualizes the observations against published evidence, examines unexpected findings, and highlights the practical significance of the work.
Conclusion: A brief concluding statement summarizing primary takeaways and indicating concrete directions for subsequent empirical research.
Back Matter and Declarations: Mandatory administrative statements, including:
- Author Contributions: Formal attribution of individual tasks across the 14 standard contributor roles specified in the CRediT taxonomy, verifying valid authorship qualifications.
- Ethics Approval and Consent: Formal Institutional Review Board (IRB) or animal ethics committee protocol numbers and participant consent procedures.
- Data and Code Availability: Public repository accession numbers, persistent identifiers (DOIs), or conditions under which primary data and analytical scripts may be accessed.
- Funding and Conflicts of Interest: Explicit disclosure of external financial support with grant identifiers, along with potential financial or personal conflicts.
- References: Complete, verified bibliographic citations formatted consistently according to journal specifications.

A Short Annotated Example

The following annotated excerpt illustrates how an Introduction executes the three classical rhetorical moves—establishing the field, identifying the gap, and stating the objective—followed by the strict boundary between objective Results and interpretive Discussion.

Example: Rhetorical Moves in an Introduction

[Move 1: Territory & Significance] Hospital-acquired bacterial infections represent a growing clinical burden, contributing to prolonged patient stays and increased therapeutic costs worldwide. While broad-spectrum antimicrobial surface coatings reduce initial surface colonization by up to 70%, their bactericidal efficacy frequently degrades under routine hospital disinfection protocols.

[Move 2: The Empirical Gap] Prior investigations have evaluated individual mechanical wear cycles or chemical exposures in isolation, but no systematic trial has characterized biofilm retention under combined chemical-mechanical abrasion regimes simulating active intensive care unit operations.

[Move 3: Study Objective & Approach] Here, we evaluate the durability and residual antimicrobial efficacy of a copper-doped silane nanoparticle polymer across 500 simulated cleaning cycles. Using quantitative colony counts and atomic force microscopy, we test the hypothesis that silane covalent bonding preserves antimicrobial activity exceeding 90% despite repeated exposure to sodium hypochlorite.

Example: Contrasting Results and Discussion Text

Results (Objective Data Only): After 500 cleaning cycles, surface copper concentration decreased from 14.2 μg/cm² (SD = 1.1) to 12.8 μg/cm² (SD = 0.9), representing a mean retention rate of 90.1% (95% CI [87.4, 92.8], p = 0.012). Bacterial reduction remained at 92.4% for Staphylococcus aureus and 91.1% for Pseudomonas aeruginosa compared to uncoated control surfaces.

Discussion (Interpretation & Context): These findings confirm that covalent silane binding stabilizes copper nanoparticles against chemical oxidation by sodium hypochlorite. Unlike physical dip-coating methods that exhibit rapid delamination within 100 cycles, the current formulation retains sufficient antimicrobial density to suppress Gram-positive and Gram-negative colonization, offering a practical pathway for durable antimicrobial surfaces in clinical settings.

Common Mistakes

Authors frequently encounter avoidable manuscript revisions by falling into well-documented writing traps. The most common errors include:

Conflating Results and Discussion: Injecting speculative reasoning, mechanistic explanations, or literature comparisons into the Results section, or presenting novel data for the first time in the Discussion.
Omitting Negative or Non-Significant Outcomes: Excluding planned endpoints or hypotheses that yielded non-significant results. Selective reporting distorts the scientific record and violates reporting standards.
Under-Describing Methodology: Omitting exact software version numbers, reagent catalog codes, dilution ratios, or blinding protocols. If an independent laboratory cannot reproduce the procedure, the Methods section is incomplete.
Extrapolating Beyond the Data: Drawing expansive conclusions, policy mandates, or universal clinical claims that go beyond the narrow sample, duration, and conditions evaluated in the experiment.
Discrepancies Across Sections: Inconsistencies between numerical values reported in the Abstract, summary figures, and narrative text. Every number cited must match across all displays.
Neglecting Reporting Guidelines: Submitting a clinical trial, observational study, or meta-analysis without consulting the relevant international checklist (such as CONSORT or STROBE), leading to immediate editorial rejection.

Checklist

Before submitting a manuscript for peer review, verify each element against the following quality checklist:

Manuscript Section	Verification Item	Standard or Guideline
Title & Abstract	Study design stated in title; structured abstract contains objective, sample size, primary outcome, numeric results with 95% CIs, and conclusion	ICMJE / CONSORT Item 1
Introduction	Literature context established; specific knowledge gap clearly defined; testable hypothesis or aim explicitly stated	Swales CARS Model
Methods: Ethics	Institutional Review Board (IRB) or ethics committee name, approval protocol number, and written informed consent confirmed	Declaration of Helsinki / ICMJE
Methods: Reproducibility	Exact equipment models, manufacturer details, biological reagents, chemical purity, and complete statistical software code documented	EQUATOR Network Standards
Results: Reporting	Primary and secondary outcomes reported sequentially; absolute counts given alongside percentages; no interpretive claims present	ICMJE Section IV.A.3
Discussion: Scope	Findings linked to initial hypothesis; comparisons to prior published literature made; broader implications outlined	ICMJE Recommendations
Declarations	CRediT contributor roles specified for all authors; funding grant IDs documented; persistent data repository DOI provided	CSE / CRediT Taxonomy

Discipline Differences

While the IMRAD sequence forms the baseline across empirical science, specific fields adapt sections to match their methodological frameworks:

Discipline Field	Structural Adaptation	Primary Reporting Standards	Data & Code Expectations
Clinical & Health Sciences	Strict IMRAD sequence with explicit subheadings; participant flow diagrams required; trial registration numbers mandatory	CONSORT (trials), STROBE (observational), PRISMA (reviews) via EQUATOR	Mandatory clinical trial registry deposit; shared de-identified patient data per ICMJE rules
Laboratory & Bench Sciences	Often combines Results and Discussion into a unified section, followed by a detailed stand-alone Experimental section	ARRIVE (animal studies), MIAME (microarray), IUPAC guidelines	Deposition of crystallography (CCDC), protein structures (PDB), or raw spectral data in specialized archives
Social & Behavioral Sciences	Extended Introduction establishing theoretical paradigms; Methods subdivided into Participants, Measures, and Procedure	APA Style JARS (Journal Article Reporting Standards: Quant, Qual, Mixed)	Open Science Framework (OSF) preregistration; public sharing of psychometric scales and analysis scripts
Engineering & Computer Science	IMRAD adapted to Problem Formulation, Proposed Architecture / Algorithm, Experimental Setup, and Comparative Evaluation	IEEE Guidelines, ACM Reporting Standards	Open-source code repositories (GitHub, Zenodo), public benchmark datasets, and computational artifact badges

FAQ

What order should you write a scientific paper in?

The most efficient drafting sequence begins with the visual data displays (tables and figures) and the Methods section, as these reflect the completed experimental work. Next, draft the Results to establish the empirical narrative, followed by the Introduction to frame the research question around those findings. Draft the Discussion to interpret the results in the context of the literature. Finally, write the Abstract and Title once the entire manuscript is complete to ensure accurate representation.

What is the standard length of a scientific paper?

Full-length original empirical research articles typically range between 3,000 and 5,000 words, excluding references, tables, and figure captions. Short communications or letters are generally restricted to 1,500 to 2,500 words with limited displays, while comprehensive review articles frequently exceed 8,000 words. Always check target journal author instructions for strict word and display count limits.

How do you choose between active and passive voice in scientific writing?

Modern scientific style guides, including APA 7th edition and major journal editorial policies, recommend active voice for clarity and direct attribution when describing author decisions (for example, “We calculated the mean response time”). Passive voice remains acceptable in the Methods section when the procedure or object of study is the focal point rather than the actor (for example, “Samples were incubated at 37°C for 24 hours”).

What is the difference between Results and Discussion?

The Results section provides an objective, unbiased report of what was found, describing data trends, statistical significance, and factual observations without interpretation. The Discussion section explains what those findings mean, evaluates how they answer the research question, compares the findings with prior published literature, and discusses broader practical implications.

Do you need to follow a reporting guideline for every study?

Major peer-reviewed journals require authors to complete and submit validated reporting checklists corresponding to their specific study design. These include CONSORT for randomized trials, STROBE for observational studies, PRISMA for systematic reviews, and ARRIVE for animal experiments. Adhering to these guidelines from the EQUATOR Network ensures transparency, facilitates peer review, and minimizes post-submission revision requests.

Sources

International Committee of Medical Journal Editors (ICMJE). Recommendations for the Conduct, Reporting, Editing, and Publication of Scholarly Work in Medical Journals: Preparing a Manuscript for Submission to a Medical Journal. https://www.icmje.org/recommendations/browse/manuscript-preparation/preparing-for-submission.html (Accessed 2026-11-08).
EQUATOR Network. Enhancing the QUAlity and Transparency Of health Research: Reporting Guidelines for Main Study Types. https://equator-network.org/ (Accessed 2026-11-08).
Council of Science Editors (CSE). Editorial Policy Committee Recommendations and Publication Integrity Guidelines. https://www.councilscienceeditors.org/ (Accessed 2026-11-08).
U.S. National Library of Medicine (NLM). Research Reporting Guidelines and Initiatives. https://www.nlm.nih.gov/services/research_report_guide.html (Accessed 2026-11-08).