The main types of research articles are original research articles, review articles, short communications, case reports, technical notes, data papers and opinion pieces. In an original research article you report new data fully. Reviews come in four kinds, namely narrative, systematic, scoping and meta-analysis. Short communications are also called brief reports. Then come case reports and case studies, technical notes and methods papers, and data papers. Perspectives, editorials and letters to the editor are the opinion pieces. But the list and the limits change journal to journal.
As a PhD scholar you mostly want to know two things. Which type suits the work you have done, and will your university count that type? We go type by type, then to the journal’s list, and last to PhD stages. Last reviewed September 2026.
What are the main types of research articles?
Very few journals take all eleven types in the table. A general science journal may be taking only research articles and systematic reviews. A clinical journal will mostly take case reports and letters also.
| Article type | What it contains | Typical length | Who writes it | Counts for a PhD requirement? |
|---|---|---|---|---|
| Original research article | New data or new analysis, written up in full (IMRaD) | Full length, depends on the journal | The researchers who did the study | Yes, where a requirement exists |
| Narrative review | An organised summary of what is already known on a topic | Often full length | Often invited experts | Often, but some want original work. Check |
| Systematic review or meta-analysis | Search, screening and synthesis done as per a protocol. A meta-analysis also pools the results | Full length plus search files | Teams, often with a scholar | Usually treated as a review |
| Scoping review | A map of what research is there on a broad question | Full length | Teams | Usually treated as a review |
| Short communication or brief report | One small finding which is complete in itself | Much shorter, depends on the journal | Researchers with one clear result | Sometimes. Ask first |
| Case report or case study | One patient, site or organisation studied in detail | Short in medicine, longer in other fields | Clinicians, practitioner-researchers | Varies by field and university |
| Technical note or methods paper | A new method, tool or protocol, along with evidence that it works | Short to full length | Whoever built or tested it | Often, in science and engineering |
| Data paper | A description of a dataset that others can reuse | Varies | Teams who collected the data | Uncertain |
| Perspective or commentary | An opinion about a field, with arguments for it | Short | Usually invited, senior | Rarely |
| Editorial | The editor’s introduction or opinion | Short | Editors | No |
| Letter to the editor | A reply to an article already published | Very short | Any careful reader | Almost never |
There is no standard naming. As per Springer Nature’s guidance for authors, the full report of original research may be called an Original Article, a Research Article, Research, or simply Article. Each journal picks its own name. In a physics journal a “letter” can be a short research paper, but in a medical journal it usually means correspondence. So read the journal’s description and don’t go only by the name.
We kept the last column cautious deliberately. Two departments of the same university may read the word “publication” differently. Anyone who sat in a few DC meetings has seen this.
What does an original research article look like? (format and example)
An original research article reports a study done by you. The detail should be enough for someone else to check your work. In the sciences, medicine, engineering and most quantitative social science, the format is IMRaD, which stands for Introduction, Methods, Results and Discussion. Around these come a title, an abstract and the references.
Take a made-up example. A commerce scholar did a survey of small retailers in two districts about how they use UPI payments. Her paper will be arranged like this.
- Title: says what was studied, where, and how (“UPI adoption among small retailers in two districts of Tamil Nadu: a survey study”).
- Abstract: short, and inside whatever word limit that journal has given. Many times it is structured as purpose, method, findings and implications.
- Introduction: why UPI use in small shops is worth studying, earlier studies, and the gap her survey fills.
- Methods: the sample, the questionnaire and how she validated it, then the analysis.
- Results: the tables, and what each table is showing.
- Discussion: the meaning of the results, how they compare with earlier work, and the limitations.
Many humanities articles skip IMRaD and argue under thematic headings. That is normal.
The writing part (each section, the order of drafting, words for each) is in how to write a research paper.
What are the types of review articles?
A review has no new data of its own. It reports what other studies show when you take them together. So scholars think it is easy, and that is where mistakes happen.
A narrative review is an expert’s organised write-up on a topic. There is no fixed search method for it. Mostly journals invite these. Springer Nature advises checking the journal website first, since some journals will not consider a review that they did not ask for. If you are not sure, send a pre-submission enquiry to the editor. For planning and writing one, read how to write a review article. If you are in second year and nobody invited your narrative review, a good journal will mostly send it back.
A systematic review takes one focused question and answers it with a documented search, screening against written criteria, appraisal and synthesis. Reporting follows PRISMA 2020. The method is visible to everyone, so journals are much more willing to accept these from early-career researchers. A meta-analysis pools the effect sizes from studies that can be compared, and usually it is done inside a systematic review. A scoping review maps what researches exist on a broad question, and for reporting it you follow PRISMA-ScR.
For the protocol, the search, the screening and the flow diagram, go to the systematic review guide.
What are short communications, case reports, methods papers and data papers?
Short communication or brief report
A short communication is a proper research paper in a smaller size. You give one finding, with a short introduction and compact methods. Springer Nature describes short reports or letters as brief reports of original data, and says they help when the results are time sensitive. Peer review for a short communication is the same as for any other article. Each journal sets its own limits for this type.
Case report and case study
In medicine a case report is about one patient, or a small series of patients, from whom something can be learnt. Many clinical journals want you to follow the CARE guidelines. The CARE checklist has 13 items. The last ones cover the patient’s perspective and informed consent. Without consent the journal will not publish the case.
In management or education the word “case study” means an in-depth study of one organisation or one programme. Such a study can be a full research article by itself.
Technical note and methods paper
Here you present a new method, test, protocol or software. Springer Nature expects an advance that you can demonstrate over what is available now. Some engineering scholars have one inside their methodology chapter and never notice.
Data paper
A data paper describes a dataset so others can reuse it. Scientific Data uses the name Data Descriptor for this. As per its guidelines, a Data Descriptor should not contain results, discussion or analyses. The sections are background, methods, the data record, technical validation and usage notes.
Do editorials, perspectives and letters to the editor count?
For a PhD requirement, almost never. Personally I would not give thesis time to them.
Perspectives and commentaries argue for a position, and mostly they are by invitation. Editors write the editorials. A letter to the editor is a response to some paper already published. It is good practice in close reading, but not a research output.
The label matters because of how Scopus works. Every record in Scopus has a document type. As per its Content Coverage Guide, case reports, technical notes and short communications are counted as “Article”. Letters, notes, editorials, reviews and data papers each get their own label. So if your ordinance asks for research articles in Scopus-indexed journals, a letter in a Scopus journal still shows as a Letter. To check a record yourself, see the Scopus indexing guide.
Conference papers have different rules. See conference paper vs journal paper.
How do you find which article types a journal accepts?
You will find this in the author guidelines. Checking it hardly takes ten minutes.
Open the author guidelines
Go to the journal’s own website and look for Guide for Authors, Submission Guidelines or Instructions for Authors. Some third-party template site is not the right source for this.
Find the article types list
There is mostly a heading like Article types or Types of paper. Note which types it takes.
Note the limits for your type
For your type, note the word count, abstract length and structure, number of figures, tables and references, and any reporting checklist they want.
Check who may submit it
A few types are by invitation only. If the page says nothing on this, write a short pre-submission enquiry to the editor.
Read two recent examples
Pick two published articles of the same type from that journal. They show the actual headings and length.
Journals differ a lot. PLOS ONE lists research articles, systematic reviews, meta-analyses, registered reports, lab protocols, study protocols and clinical trials. As per PLOS ONE, a manuscript can be of any length, but the abstract has a 300-word cap. It has no short communication or case report category. A clinical journal may be listing many more types, with a separate word limit for every type.
Submitting a paper under the wrong type is one simple way to get rejected fast. Other common reasons are listed in why papers get desk rejected.
Which article type fits your PhD work at each stage?
Decide the type based on what you actually have in hand.
- If you drafted the literature chapter after coursework, it may become a systematic or scoping review, but only if you do the search again properly. A synopsis literature chapter in its current form is not a review article.
- A pilot study that gave a real finding can go as short communication. Most pilots, though, belong in the methods chapter only.
- For a new instrument, protocol or tool, think of a methods paper or a technical note.
- Once your analysis chapter is complete, convert that into an original research article and give it first priority.
A worked example
Think of a made-up history scholar working on colonial-era land revenue records in a state archive. In her second year she converts the literature chapter into a narrative review on how historians have used those records. In third year she comes across a bundle of village registers in the archive. They give her one clear finding that stands alone, so she sends it as a short research note to a journal which publishes that type. Her main analysis chapter turns into a full research article. Say her ordinance asks for one research article in a Scopus or Web of Science journal. Only the third paper will surely meet that. Still the first two are not waste, as they make her thesis stronger and examiners ask her fewer questions.
Many scholars are asking about a review in year two because it looks faster. Please don’t, as a proper review takes months of work. To know what UGC 2022 changed and how to read the rule of your own university, see is publication mandatory for a PhD. When the type is clear, how to choose a journal will help you pick the journal.
Want a specialist to help with this in your own work? Research Paper Review Before Submission: a free first consultation, then a written scope and fixed quote.
Sources
- Springer Nature: references and article types (writing a manuscript)
- PLOS ONE submission guidelines (article types and length)
- Scientific Data submission guidelines (Data Descriptor structure)
- Elsevier: Scopus Content Coverage Guide (PDF), section 3.1 Document types
- CARE case report guidelines: checklist
- UGC (Minimum Standards and Procedure for Award of Ph.D. Degree) Regulations, 2022 (PDF)
FAQ
Questions scholars ask
What is the difference between a research paper and a research article?
There is hardly any difference. In daily talk people say “research paper”. Most journals call the same type “research article” or “original article”.
Is a review article counted as a publication for PhD submission?
That depends on your university. A few universities count any peer-reviewed article in an approved journal. Others want original research only. Get the answer from the research cell in writing.
Is a short communication peer reviewed?
Yes, at a genuine journal it is. The paper is shorter, but the review is not lighter.
Is a letter to the editor indexed in Scopus?
Usually yes, if the journal itself is indexed. But Scopus labels it as a Letter and not as an Article, so it will rarely satisfy a research article requirement.
Should I write a review before my first original article?
Do it only when you can do it systematically and your field gives value to reviews. What all that work involves, you can see in the systematic review guide.
