Within Duplicates
Do More Witnesses Mean More UFOs?
Independent witnesses can make a case stronger, but their reports should usually strengthen one event rather than create many events.
On this page
- Why witness clusters can be valuable evidence
- How duplicate witness reports inflate totals
- How to separate corroboration from overcounting
Page outline Jump by section
Introduction
A UFO case with ten witnesses is not automatically ten UFOs. In well-managed catalogues, multiple observers usually strengthen the evidence for a single event rather than multiply the event count itself. This distinction is important because some of the largest UFO databases contain many reports that describe the same incident from different viewpoints, submitted through different channels or recorded by different investigators. If those records are counted separately, the apparent number of UFO sightings can rise without any increase in the number of actual events. At the same time, witness clusters remain valuable because independent observers can help confirm timing, direction, duration and other details that would be difficult to establish from a lone account. The challenge for UFO databases is deciding when many reports represent corroboration and when they represent overcounting. [Center for UFO Studies]cufos.orgUFOCAT Codebook 2023Center for UFO StudiesUFOCAT 2023June 6, 2024 — Records coded with a "1" indicate investigations that are based upon an independent inves…
Why witness clusters can be valuable evidence
Multiple witnesses have long been treated as one of the factors that can make a UFO report more significant. If several people independently describe a similar object, movement pattern or sequence of events, investigators gain opportunities to compare accounts and look for consistencies or contradictions.
Project Blue Book’s evaluation system reflected this logic. Cases involving trained observers, corroborating evidence or multiple witnesses were often considered stronger investigative cases than isolated observations. The programme’s statistical reviews distinguished between the quality of reports rather than simply counting how many people claimed to have seen something. [Wikipedia]WikipediaProject Blue BookProject Blue Book
Witness clusters can provide useful checks that a single observer cannot:
- Different observers may estimate position and direction from different locations.
- Separate descriptions can reveal whether key details were shared before reporting or emerged independently.
- Large groups may help establish timing more accurately because multiple people remember the same sequence.
- Contradictions between witnesses can sometimes expose mistakes, exaggerations or misidentifications.
For investigators, the ideal situation is not merely “more witnesses” but more witnesses whose testimony can be compared independently. Ten people repeating one person’s interpretation are less useful than three people who separately provide matching descriptions.
How duplicate witness reports inflate totals
The same witness cluster can create serious counting problems once reports enter public databases.
A common pattern begins with a widely observed event. Several people submit reports to a reporting centre. Others contact local newspapers. Some send information to a UFO organisation. An investigator later interviews witnesses and produces a case file. Years afterwards, historical catalogues may import all of those sources. What began as one incident can eventually appear as numerous records. [Center for UFO Studies]cufos.orgUFOCAT Codebook 2023Center for UFO StudiesUFOCAT 2023June 6, 2024 — Records coded with a "1" indicate investigations that are based upon an independent inves…
This effect becomes especially important in large databases such as the National UFO Reporting Center archive, which contains many thousands of witness submissions collected over decades. The database is an important source of first-hand accounts, but raw report totals do not automatically represent unique events because multiple observers may report the same occurrence independently. [NUFORC]
A dramatic sighting over a city illustrates the problem. Imagine a bright object visible for several minutes across a metropolitan area:
- Twenty witnesses submit separate reports.
- Local media publish several stories.
- Social media posts are archived.
- A UFO organisation opens an investigation.
- A later catalogue imports the available sources.
A database that counts records may show dozens of entries. A database that counts events may show only one.
The difference is not trivial. Researchers sometimes use report counts to examine trends over time, geographic concentrations or spikes in activity. If witness clusters are not grouped correctly, a highly publicised event can create the illusion of a broader wave of sightings than actually occurred.
When many reports are actually evidence of one event
The strongest UFO databases attempt to separate the idea of a report from the idea of an event.
The Center for UFO Studies’ UFOCAT system is unusually explicit about this distinction. Its codebook explains that records may be connected to the same UFO occurrence and includes mechanisms for identifying primary records and related records. Researchers are advised to use those relationships when conducting statistical counts so that the same event is not counted repeatedly. Primary-record filtering is specifically intended to avoid double counting. [Center for UFO Studies]cufos.orgUFOCAT Codebook 2023Center for UFO StudiesUFOCAT 2023June 6, 2024 — Records coded with a "1" indicate investigations that are based upon an independent inves…
This approach recognises that a witness cluster has two different values:
- As evidence, multiple observers can strengthen confidence that an event occurred.
- As statistics, those observers should not necessarily increase the number of events recorded.
That distinction often disappears in popular discussions. A headline claiming “hundreds of UFO reports” may refer to hundreds of submissions rather than hundreds of independent incidents. A major meteor, rocket re-entry or astronomical event can generate a surge of reports from many locations while still representing a single underlying cause.
How investigators separate corroboration from overcounting
Determining whether reports belong to the same event is not always straightforward. Witnesses frequently disagree about times, locations and descriptions even when observing the same object.
Investigators usually look for combinations of factors rather than exact matches:
- Time proximity.
- Geographic proximity.
- Similar movement descriptions.
- Matching directions of travel.
- Shared environmental conditions.
- References to the same photographs, videos or news reports.
The process becomes more difficult when reports are submitted days or years later. Witnesses may round times, misremember dates or adopt details they encountered in media coverage.
UFOCAT’s documentation acknowledges this ambiguity by noting that relationships among witnesses, events and sources are not always clear-cut. Rather than deleting uncertain records, the catalogue attempts to preserve source information while providing ways to identify likely connections. [Center for UFO Studies]cufos.orgUFOCAT Codebook 2023Center for UFO StudiesUFOCAT 2023June 6, 2024 — Records coded with a "1" indicate investigations that are based upon an independent inves…
Modern database analysts face similar challenges. Large datasets often require automated methods to identify probable duplicates based on location, timing and textual similarity. The broader data-management problem is well known in other fields, from software bug tracking to incident reporting systems, where many independent reports can refer to the same underlying occurrence. [arXiv]arxiv.orgarXiv Rediscovery Datasets: Connecting Duplicate ReportsarXivRediscovery Datasets: Connecting Duplicate ReportsMarch 18, 2017…
The paradox of witness clusters
Witness clusters create a genuine paradox in UFO research.
From an evidential perspective, investigators often want more witnesses. Independent observers can help rule out simple memory errors and provide richer descriptions of an event. Historically, some of the most discussed UFO cases involved numerous observers rather than isolated individuals. Project Blue Book itself treated certain multi-witness cases as higher-quality reports deserving closer examination. [Wikipedia]WikipediaList of reported UFO sightingsList of reported UFO sightingsMost commonly reported shapes in UFO sightings gathered in the National UFO Reporting Center (NUFORC) On…
From a statistical perspective, however, more witnesses can distort databases if every testimony becomes a separate count. A single spectacular event may generate dozens or hundreds of reports, while several isolated events may generate only one report each. Raw totals can therefore reflect reporting behaviour as much as actual sighting frequency.
This is why experienced researchers often ask two different questions:
- How many reports were received? [documents.theblackvault.com]documents.theblackvault.comprojectbluebook report8Blue Book - Report No. 8The proce- dure of listing all reported sightings will al so be eliminated in this repor~ since gg6 reports were…
- How many distinct events do those reports represent?
Those numbers may differ dramatically.
What readers should look for in UFO statistics
Whenever a UFO database or article cites large totals, it is worth checking what is actually being counted.
Useful questions include:
- Are the figures counting reports or events?
- Does the catalogue identify primary records and duplicates?
- Are multiple witnesses grouped into a single incident?
- Can one event appear under several sources?
- Has the database been merged with other catalogues?
The most informative UFO catalogues preserve witness-level detail while also providing mechanisms to connect related records. That allows researchers to benefit from corroborating testimony without mistakenly turning one well-observed incident into many separate UFOs. In practice, witness clusters are often most valuable when they increase confidence in a single event rather than increasing the event count itself. [Center for UFO Studies]cufos.orgUFOCAT Codebook 2023Center for UFO StudiesUFOCAT 2023June 6, 2024 — Records coded with a "1" indicate investigations that are based upon an independent inves…
Amazon book picks
Further Reading
Books and field guides related to Do More Witnesses Mean More UFOs?. Use these as the next step if you want deeper reading beyond the article.
The UFO Experience
Directly supports evaluating witness quality, corroboration, and case strength without simply multiplying sightings.
UFOs
Includes witness-driven cases where testimony, corroboration, and official attention matter.
How to Lie with Statistics
Clarifies why many reports do not necessarily mean many separate events.
Mistakes Were Made (but Not by Me)
Helpful for thinking about witness confidence, memory, and interpretation without dismissing all testimony.
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Endnotes
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Source: Wikipedia
Title: Project Blue Book
Link: https://en.wikipedia.org/wiki/Project_Blue_Book -
Source: nuforc.org
Title: Data Bank | NUFORC
Link: https://nuforc.org/databank/Source snippet
NUFORCData Bank | NUFORC - Latest UFO SightingsThe NUFORC Databank is the largest independently collected set of UFO / UAP sighting repor...
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Source: nuforc.org
Link: https://nuforc.org/Source snippet
NUFORCNational UFO Reporting Center | Report a UFO | Report a UAPThe most trustworthy, transparent and respectful organization for UFO/UA...
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Source: arxiv.org
Title: arXiv Rediscovery Datasets: Connecting Duplicate Reports
Link: https://arxiv.org/abs/1703.06337Source snippet
arXivRediscovery Datasets: Connecting Duplicate ReportsMarch 18, 2017...
Published: March 18, 2017
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Source: nuforc.org
Title: NUFOR C Reports by Location NUFORC Reports by Location; USA
Link: https://nuforc.org/ndx/?id=locSource snippet
NUFORC Reports by LocationNUFORC Reports by Location; USA - Alabama, 1529; USA - Arkansas, 1367; USA - Arizona, 5349; USA - Californi...
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Source: nuforc.org
Link: https://nuforc.org/ndx/?id=shapeSource snippet
NUFORC Reports by ShapeNUFORC Reports by Shape; Chevron, 1911; Cigar, 4164; Circle, 15854; Cone, 675.Read more...
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Source: nuforc.org
Title: report a ufo
Link: https://nuforc.org/report-a-ufo/Source snippet
File a UFO Report | NUFORCThe Center's hotline at 206-722-3000 is generally reserved for recent UFO reports. However, brief queries may b...
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Source: nuforc.org
Link: https://nuforc.org/map/ -
Source: Wikipedia
Title: List of reported UFO sightings
Link: https://en.wikipedia.org/wiki/List_of_reported_UFO_sightingsSource snippet
List of reported UFO sightingsMost commonly reported shapes in UFO sightings gathered in the National UFO Reporting Center (NUFORC) On...
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Source: Wikipedia
Title: Identification studies of UFOs
Link: https://en.wikipedia.org/wiki/Identification_studies_of_UFOsSource snippet
Identification studies of UFOsWhen Project Blue Book closed down in 1970, only 6% of all cases were classified as being truly unidenti...
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Source: cufos.org
Title: UFOCAT Codebook 2023
Link: https://cufos.org/PDFs/UFOCAT%20Codebook%202023.pdfSource snippet
Center for UFO StudiesUFOCAT 2023June 6, 2024 — Records coded with a "1" indicate investigations that are based upon an independent inves...
Published: June 6, 2024
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Source: cufos.org
Link: https://cufos.org/cufos-publications-databases/ufocat/Source snippet
Center for UFO StudiesUFOCATUFOCAT-2023 refers to a computer database of over 300,000 entries. In this total are over 192,000 primary UFO...
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Source: [archives]({{ ‘archives/’ | relative_url }}). gov
Link: https://www.archives.gov/research/military/air-force/ufosSource snippet
Project BLUE BOOK - Unidentified Flying Objects25 Jun 2024 — From 1947 to 1969, a total of 12, 618 sightings were reported to Project BLU...
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Source: britannica.com
Title: Project Blue Book
Link: https://www.britannica.com/topic/Project-Blue-BookSource snippet
Definition, History, Aliens, UFOs, & Facts16 May 2026 — From 1952 to 1969 Project Blue Book compiled reports of 12,618 sightings or event...
Published: May 2026
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Source: ada-nuforc-analysis.github.io
Link: https://ada-nuforc-analysis.github.io/Source snippet
NUFORC Report AnalysisThe NUFORC checks each reports for fakes or hoax and comments them accordingly. The reports are classified by their...
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Source: documents.theblackvault.com
Title: projectbluebook report8
Link: https://documents.theblackvault.com/documents/ufos/projectbluebook-report8.pdfSource snippet
Blue Book - Report No. 8The proce- dure of listing all reported sightings will al so be eliminated in this repor~ since gg6 reports were...
-
Source: history.com
Title: Project Blue Book
Link: https://www.history.com/articles/project-blue-bookSource snippet
Alien, Definition & Files22 Feb 2010 — Similarly to the Robertson Panel, Blue Book would eventually classify more than 90 percent of thes...
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Source: metabunk.org
Title: nuforc sightings categorized by decade and shape.14610
Link: https://www.metabunk.org/threads/nuforc-sightings-categorized-by-decade-and-shape.14610/Source snippet
NUFORC sightings categorized by decade and shape1 Dec 2025 — Interesting. I've been working on a report rating scheme to grade UFO report...
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Source: bahaistudies.net
Title: project blue book
Link: https://www.bahaistudies.net/asma/project_blue_book.pdfSource snippet
29 Sept 2012 — The Air Force groups its evaluations of UFO reports under three general headings: (1) identified. (2) insufficient data...
Additional References
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Source: neurosciarchive.byethost12.com
Link: https://neurosciarchive.byethost12.com/1984-Persinger-and-Derr-PMS-Geophysical-variables-and-human-behavior–XIX-strong-temporal-relationships-between-inclusive-seismic-meas.pdfSource snippet
VARIABLES AND HUMAN BEHAVIOR: XIX.They in- cluded the following perceptual characteristics: "the UFO moved in a non- continuous trajector...
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Source: esd.whs.mil
Link: https://www.esd.whs.mil/Portals/54/Documents/FOID/Reading%20Room/UFOsandUAPs/proj_b1.pdf?ver=2017-05-22-113513-837Source snippet
Blue BookThe Air Force groups its evaluations of UFO reports under three general headings: (1) identified. (2) insufficient data, and (3...
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Source: kaggle.com
Link: https://www.kaggle.com/datasets/bitterfq/nufroc-ufo-sightingsSource snippet
NUFROC UFO SIGHTINGSThis CSV dataset contains detailed information scraped from the National UFO Reporting Center website, including repo...
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Source: nicap.org
Link: https://www.nicap.org/books/Behavioral_Scientist/UFO_Phenomena_and_Behavioral_Scientist.pdfSource snippet
UFO Phenomena and the Behavioral ScientistI just hope that this book will help the time come sooner when they will not only understand th...
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Source: af.mil
Link: https://www.af.mil/About-Us/Fact-Sheets/Display/Article/104590/unidentified-flying-objects-and-air-force-project-blue-book/Source snippet
Unidentified Flying Objects and Air Force Project Blue BookWith the termination of Project Blue Book, the Air Force regulation establishi...
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Source: huggingface.co
Link: https://huggingface.co/datasets/kcimc/NUFORCSource snippet
kcimc/NUFORC · Datasets at Hugging FaceUFO sighting in Kiev, Ukraine. Witness elects to remain totally anonymous; provides no contact inf...
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Source: observablehq.com
Link: https://observablehq.com/%407a596ea349ab5d1c/ufo-sightings -
Source: sofrep.com
Title: the truth behind ufos from project blue book to the pentagons uap task force
Link: https://sofrep.com/news/the-truth-behind-ufos-from-project-blue-book-to-the-pentagons-uap-task-force/Source snippet
The Truth Behind UFOs: From Project Blue Book to the...8 Feb 2026 — Project Blue Book had two main goals: to determine whether UFOs posed...
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Source: blaze.tv
Link: https://www.blaze.tv/series/quick-history-us-governments-secret-ufo-project-blue-bookSource snippet
A quick history of the US government's secret UFO project '...Project Blue Book was set up to be much more in-depth, robust and open-minded...
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Source: facebook.com
Title: Data encompasses all reports of UFO sightings dating back
Link: https://www.facebook.com/FOX2Now/posts/data-encompasses-all-reports-of-ufo-sightings-dating-back-to-1995-sightings-with/1246651517051476/Source snippet
reported UFOs. In 1976, multiple witnesses reported a strange object landing in Sioux Falls, and a few youngsters reported their observation...
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