Crafting a Comprehensive Methods Section for Student Research Papers

The methods section of a research paper is paramount, acting as a blueprint that details the validity of the study and the credibility of the results. A methods section must include sufficient detail so that others could repeat the study and reproduce the results. Its structure should flow logically and chronologically. This article provides a guide to constructing an effective methods section, tailored for students and applicable across various disciplines.

Importance of the Methods Section

An inadequate description of the methods has been reported as one of the main reasons for manuscript rejection. The methods section describes what was done to answer the research question. It specifies how the research was done, the rationale for the procedures, what materials were used, and how the results were analyzed, all in a clear, concise, and organized manner. It is analogous to a recipe, providing a detailed account of the ingredients, tools, and instructions needed to replicate the experiment or study.

Essential Components of the Methods Section

There are multiple components of methods sections, including study design, materials used, study procedures, and data analysis. In general, common components of the methods section include a description of the study design, materials used, study procedures, measurements or calculations, and the statistical tests used to analyze the results. Each element must be adequately described and thoroughly detailed to provide an understanding of how the results were obtained and how to interpret the findings. Studies that involved humans or animals must include an ethics statement of approval from the appropriate governing body.

Study Design

The methods section often begins with an overall description of the study design and key attributes, including the type of study, setting, time frame, and procedures. This provides an overview and context for how the study was conducted with further details and specifics described in subsequent subsections. Common study designs include observational, bench evaluation, systematic review, randomized controlled trial, survey, and others.

Guidelines for writing the manuscript include the Consolidated Standards of Reporting Trials (CONSORT) checklist for randomized controlled trials and Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines for systematic reviews. Registration is another consideration for clinical trials and systematic reviews. The International Committee of Medical Journal Editors (ICMJE) requires registration of clinical trials on a public trials registry. The setting where the study occurred, if it included data from a single-center or multiple centers, and the time frame in which it took place must be included because these factors have implications for clinical practice, generalizability, and validity. Potential study settings might include an ICU (or specific ICU type), medical surgical ward, emergency department, out-patient clinic, home-care environment, or simulation laboratory. The time frame is an essential element for context because practices and trends change over time.

Participants

The methods section should explain how subjects were identified and should state inclusion and exclusion criteria. Characteristics of the study population should be described. This includes basic demographics (eg, adults or children, age, sex) and general health status such as if the individuals were healthy volunteers or had a specific diagnosis or condition. This information is also needed for control groups. Inclusion criteria for how subjects were identified and selected should be detailed as well as reasons for exclusion. When referring to human subjects in research, the terms subject and patient are often used interchangeably, but there is a difference. A patient receives care to improve health, and care is individualized in each particular case. When a patient participates in research, he or she becomes a subject. In research, care is designed to create information and is the same for all subjects based on the study protocol. The individual conducting the research is not always involved in the patient care provided, thus also making the distinction between subject and patient. A common error is to use the word subjects exclusively when writing the manuscript. However, individuals are patients before enrollment. When referring to the broader population of individuals who might benefit from the research findings, the word patients is likely more correct. Participant and volunteer are other terms that can be used in place of subject. In addition to humans, research subjects may also involve animals or organisms such as cells. When animals are studied, the methods should describe the species, weight, age, and sex of the animals.

Materials

All materials used to complete the study should be described in detail, including equipment, drugs, gases, chemicals, treatments, interventions, or other items. Materials used to conduct research are comparable with the ingredients, tools, and equipment for a recipe. Materials represent what was studied, including subjects, equipment or devices, and treatments or interventions. Identify all equipment and other materials used in the study, including devices, related accessories, drugs, or chemicals. At first mention of any device, provide the specific name of the item, model number if applicable, and manufacturer information. Many scientific journals do not usually allow use of trademark or registration symbols. The ICMJE recommends that manufacturer name and location be included in parentheses. For example, a study that evaluated the safety and feasibility of breathing high-dose nitric oxide in healthy volunteers used a Sievers 280i nitric oxide analyzer (GE Analytical Instruments, Boulder, Colorado) to measure nitric oxide gas concentration. Subsequent mentions of equipment should be noted by generic name versus trade name when possible. Use of figures can be an effective means of providing a visual description of the equipment setup, especially when there are many components involved. This can also help reduce the amount of text and improve understanding of how the equipment was assembled. Figures can be either a photograph of the equipment or a graphic illustration (line drawing), but all components should be clearly labeled. In addition to naming the specific equipment used in the study, settings should also be included in the methods section because these details are highly relevant for duplication of the study. Equipment preparation is another consideration for the methods section. Describe the calibration process and the frequency for equipment that requires calibration. If manufacturer standards for calibration are not followed, then the accuracy of the results may be affected. In addition to equipment, identify all drugs, chemicals, gases, or other materials used specifically for the study. The details for drugs and gases should include the concentration, dose, frequency, and route of administration. Gases should also note the flow used. Chemicals should be noted with the name and concentration as applicable. Use the generic name for drugs. If the trade name for a drug is relevant to the study, then follow the same process for identifying equipment brands and manufacturer information and use the generic name after initial identification. Preparation information may be needed in some cases.

Procedures

Study procedures should outline all steps taken to obtain the results and clearly state the outcome measures. The methods section should explicitly detail all procedures, treatments, or interventions used in the study. This portion of the methods section describes how study procedures were performed, the chronological order of procedures, measurements or calculations made, and the specific data elements collected. A comprehensive explanation of the procedures is vital for providing adequate details for reproducibility and validity regardless of the study design. Diagrams and flow charts can be helpful for illustrating processes or workflow.

Data Analysis

Explain how you intend to analyze your results. Will you use statistical analysis? Provide background and rationale for methodologies that are unfamiliar for your readers. The researcher should explain the nature of the collected data, how the measurements were made, and whether it was subjected to any transformations prior to analysis. It also must describe the statistical tests that were performed to analyze the data. The description of statistical tests is often organized with direct relevance to the researchersâ various hypotheses and ensures that post hoc analyses and mathematical corrections are described alongside all primary analyses.

Ethics Statement

The United States Department of Health and Human Services defines a human subject âas a living individual about whom an investigator (whether professional or student) conducting research obtains information or biospecimens through intervention or interaction with the individual, and uses, studies, or analyzes the biospecimens; or obtains, uses, studies, analyzes, or generates identifiable private information or identifiable biospecimens.â The methods section must include a statement regarding approval from an institutional review board (IRB) or ethics committee for research that included human subjects. Quality improvement studies and certain types of surveys are often not considered human subject research and therefore may not require IRB oversight but the decision is made by the IRB. Animal studies also require ethics approval to be reported in the methods section. Research that involves animals is subject to approval from the local Institutional Animal Care and Use Committee and must be conducted in accordance with national guidelines, for example, the National Institute of Health Public Health Service Policy on Humane Care and Use of Laboratory Animals. For journals that do not have a specific requirement for where to include the ethics statement within the methods section, many authors typically incorporate it in the initial general description of the study or with the detailed description of the subjects.

Structuring the Methods Section

The methods section should be structured for logical and chronological flow. Use past tense for writing the methods section because the study has been completed and describes what was already done. Use of subheadings can be helpful for organizing the different components for the methods section when there is a substantial amount of detail to describe. However, subheadings may not be required by some journals. An excessive use of subheadings can be distracting to the reader by interrupting the flow of the manuscript. There should not be a subheading for every paragraph. This is particularly distracting when each subheading is followed by a short 1- or 2-sentence paragraph. Paragraphs with fewer than 3 sentences should be avoided; combine the information with another paragraph unless the journal to which the paper will be submitted requires specific subheadings.

Avoiding Common Errors

A common error in manuscript writing is reporting results in the methods section and vice versa. A frequently occurring example is including the number of subjects who participated in the research in the methods section when it was unknown how many met inclusion criteria before study initiation and subject screening. The methods section should only include information available during the planning phase, before study initiation. There are instances in which study procedures may have changed after the study commencement. This information would be reported in the methods section but the outcomes stated in the results section.

Tailoring the Methods Section to Different Audiences

Your results and the interpretation of these results depend on the methods you used to obtain them. A reader who is skeptical of your results will read your Methods section to see if they can be trusted. Theyâll want to know that you chose the most appropriate methods and that your approach is technically correct. Typically, only readers in your field will want to replicate your study or have the knowledge to assess your methodology. More general audiences will read the Introduction and then proceed straight to the Results. You can therefore assume that people reading your Methods understand methodologies that are frequently used in your field. If your paper is designed to appeal to experts in more than one field, you still need to write your Methods for a single set of experts. For example, say you applied a novel computational approach to gain new insight into the physics of a well-characterized semiconductor device. Is your goal to show electrical engineers the value of your computational tool in characterizing and designing electronic systems, or to show computational scientists how they can help study semiconductor device physics? A reader looking to assess your methodology will read the Methods section to judge your experimental design, system or algorithm design, and technical approach. When describing a standard experimental technique or method, place more emphasis on how you applied a method rather than on how you performed the method. For example, after gauging your technical audience, you may decide that you donât need to explain how to take an SEM image or how a convolutional neural network works. However, you may still want to describe why SEM imaging or a convolutional neural network is an appropriate approach for the task at hand (and, potentially, why you didnât use another method).

Additional Tips for Writing a Strong Methods Section

Be Comprehensive: The methods section should contain all the information that would be needed to replicate your research. This means making sure that your methods section is comprehensive and full of detail. You may wish to use reporting guidelines to scaffold your writing. Every methods section has some key components and these reporting guidelines can help you to find out what they are.
Address Potential Limitations: Are there any practical limitations that could affect your data collection? How will you attempt to control for potential confounding variables and errors? Do not ignore these problems or pretend they did not occur. Often, documenting how you overcame obstacles can form an interesting part of the methodology.

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Use Subheadings Effectively: Use subheadings within your Methods to group related experiments or ideas and establish a logical flow. One approach that can be useful is to write your Results section first, and then follow the order of Results subheadings when writing your Methods. Subheadings for Methods and Results may not exactly correspond. Sometimes you may need multiple Methods subheadings to explain one Results subheading. Subheadings can be used to divide separate technical aspects of your proposed approach. You may have one subheading on âFeature learning,â one on âClustering,â and so on.
Cite Appropriately: For readers to replicate your study, you must provide enough detail to allow them to reach the same conclusions as you do in your paper. That said, try to avoid including extraneous details. You can cite papers for standard methods, but any modifications or alterations should be clearly stated. When citing methods, cite the original paper in which a method was described instead of a paper that used the method. This helps avoid chains of citations that your reader must follow to find information about the method.

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