How Do You Distinguish “Found,” “Screened,” “Read,” “Included,” and “Cited” Papers?

What Has Actually Happened to Each Paper in Your Literature Workflow?

A paper appears in your database search. You save it. Later you inspect the abstract, read several pages, decide it belongs in your analysis, and eventually cite it in your manuscript.

Those actions may feel like one continuous process, but they represent different decisions.

Trouble begins when a literature-management system collapses them into a single category such as “papers I have.” A saved paper may never have been screened. A thoroughly read paper may ultimately be excluded. An included study may inform an analysis without being cited every time you discuss the topic. Conversely, a paper may be cited for background without belonging to the formal evidence set of a review.

Distinguishing these statuses gives you a more accurate picture of what you have actually done with the literature.

Each Label Describes a Different Research Event

Separate Discovery, Evaluation, Use, and Reporting

“Found” Means the Source Entered Your Discovery Space

A found paper is one you encountered through a database search, citation trail, alert, recommendation, website, colleague, or another discovery route. At this stage, its presence says almost nothing about its eventual usefulness.

You may have only a title and bibliographic record. You may not have opened the abstract, retrieved the full text, or decided whether the source genuinely addresses your question.

For a formal systematic review, terminology needs additional precision. PRISMA distinguishes records, reports, and studies because one study can generate several reports and a single bibliographic record is not necessarily equivalent to a unique study. For everyday literature management, “found paper” can be a convenient working label, but formal review reporting should use the terminology required by the applicable methodology.

“Screened” Means You Made an Initial Relevance or Eligibility Judgment

Screening means that the source has passed through an explicit evaluation step. In a systematic review, this commonly includes title and abstract screening followed, for potentially eligible reports, by retrieval and full-text eligibility assessment.

In less formal literature work, screening may simply mean that you checked whether the source appears relevant enough to deserve further attention.

The important distinction is that a paper sitting in your reference manager has not necessarily been screened. Saving, downloading, or importing metadata is not itself evidence that you evaluated the source.

“Read” Needs an Operational Definition

Reading is surprisingly difficult to represent with a single binary label. Does “read” mean that you read every page? That you carefully examined the methods and results? That you read only the sections needed to answer a particular question?

There is no universal methodological definition of “read” that suits every literature-management workflow. You therefore need to decide what the status means in your own system.

A source can therefore be screened without being substantively read. Conversely, you might read a paper for background even though it is not being screened for inclusion in any formal review.

“Included” Should Always Mean Included in Something

The word “included” becomes meaningful only when the set is defined.

In a systematic review, an included study satisfies the review's eligibility criteria. Cochrane guidance emphasizes that eligibility criteria should be prespecified and that selection decisions should be documented. PRISMA reporting then accounts for studies included in the review and, where applicable, reports contributing to particular syntheses.

In another kind of project, “included” might instead mean included in a literature matrix, qualitative synthesis, dataset, evidence map, or a deliberately defined body of literature.

Whatever definition you use, avoid letting “included” mean merely “I decided to keep the PDF.” The decision to keep something in your permanent reference library is not automatically an inclusion decision.

“Cited” Is a Reporting Status, Not a Quality or Inclusion Status

A cited source is one you explicitly reference in a manuscript, thesis, report, presentation, or other research output. Citation tells you that the source appears in the scholarly communication you produced. It does not, by itself, tell you how thoroughly you read the source or what role it played in an analysis.

This creates several perfectly legitimate combinations. You might cite a methodological paper that was never eligible for your systematic review because it explains the analytical method you used. You might include an eligible study in a synthesis without discussing that individual study extensively in the narrative. You might read a foundational paper closely but ultimately decide that it does not need to appear in a particular manuscript.

Citation therefore should not be used as a substitute for screening, reading, or inclusion status.

The Statuses Form a Workflow, but Not Always a Simple Funnel

For some projects, papers move approximately from discovery to screening to reading or assessment to inclusion and finally to citation. That makes a funnel-like model useful.

But real research is less tidy.

You may find and immediately cite an authoritative methodological source without screening it for an evidence synthesis. You may read a paper carefully and exclude it. You may include a study while consulting several reports associated with it. You may return to an old paper from another project without “finding” it again in any meaningful sense.

Status Should Usually Be Project-Specific

A paper does not possess one permanent research status.

Suppose a study is excluded from Project A because its population falls outside that project's eligibility criteria. The same study may be included in Project B, read closely for Project C, and cited as background in Project D.

This is why a system for preserving notes when a paper belongs to several projects should avoid turning project-specific decisions into permanent properties of the source itself.

Do Not Confuse Reports With Studies in Formal Reviews

One of the most consequential complications appears when several papers report the same underlying study.

Cochrane explicitly advises reviewers to collate multiple reports of the same study so that the study, rather than each report, remains the unit of interest. Secondary reports should not simply be discarded because they may contain useful information about the study's design or conduct.

Thus, three apparently separate papers in your library may represent one underlying study. If all three are independently marked “included” and then counted as three pieces of evidence, the evidence base can be distorted.

This is one reason duplicate management involves more than removing identical files. Preventing duplicate documents from becoming duplicate evidence requires attention to the underlying study as well as the bibliographic record.

One Search Result Can Pass Through Several Different States

Now consider another article from the same search. It is found, screened, retrieved, and carefully read, but its participants are secondary-school students. It is therefore excluded under the review's population criterion.

The second paper may have received more reading attention than some included papers, yet it is still excluded. That apparent contradiction disappears once “read” and “included” are treated as different statuses.

Where Literature Status Tracking Usually Breaks Down

Track Decisions Instead of Merely Collecting Documents

A useful literature-management system should let you answer a few basic questions without reopening every PDF: Have I evaluated this? Have I read enough of it? Does it belong in this project's evidence set? Have I used it in the output?

You do not necessarily need five folders with these exact names. In fact, mutually exclusive folders can become awkward because several statuses may simultaneously apply. A paper can be both read and cited, for example, while “excluded” and “included” are usually project-specific decisions.

The exact labels matter less than the distinctions they preserve. Choose terminology you can apply consistently and that matches the methodological requirements of your project.

As the system becomes more sophisticated, topic, method, finding, and argumentative-role tags can describe what a paper is about or why it matters, while workflow statuses describe what you have done with it. Keeping those functions separate usually makes both more informative.

Check Whether Your Paper Statuses Actually Mean Something

Questions About Tracking Literature Status

Know What Each Status Actually Tells You

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