Research Methodology
How We Investigate the Past
At Case File History, we believe that a compelling historical story should begin with a meaningful question and develop through careful examination of the available evidence.
Our publication explores hidden and lesser-known history, lost cities, historical mysteries, old criminal cases, World War I and World War II, Cold War operations, espionage, forgotten people, and significant events that deserve closer investigation.
These subjects often involve incomplete records, conflicting accounts, disputed interpretations, or claims that have been repeated without sufficient verification.
Our research approach is designed to help us distinguish what the historical record supports from what remains uncertain.
This page explains the principles and methods that guide our historical research. The precise process may vary depending on the subject, the availability of records, and the complexity of the evidence.
1. Defining the Research Question
Every investigation begins by identifying the historical question we want to answer.
Rather than relying only on a dramatic story or a widely repeated claim, we aim to establish what needs to be investigated, which facts are already reasonably well established, and which questions remain unresolved.
For example, an investigation into a lost settlement may examine its documented location, historical references, archaeological evidence, and possible reasons for its decline.
An article about an old criminal case may focus on the surviving investigation records, court findings, contemporary reporting, and questions that remain unanswered.
A Cold War story may require examination of declassified documents, diplomatic records, intelligence assessments, and later historical research.
The research question helps determine which sources are relevant and what level of evidence is needed to support the article's central claims.
2. Identifying the Original Sources
Where relevant and available, we aim to trace important historical claims to their original sources or to reliable publications that identify and discuss those sources.
Potential research materials include
Government correspondence and official records.
Military documents and operational reports.
Court records, trial transcripts, and investigation files.
Historical newspapers and contemporary publications.
Personal letters, diaries, memoirs, and eyewitness accounts.
Archival photographs, maps, and historical documents.
Declassified diplomatic and intelligence records.
Museum, library, and archival collections.
Academic books, scholarly articles, and established historical studies.
The appropriate source depends on the question being investigated. A court record may be especially relevant to a legal outcome, while an archaeological report may be more useful for examining a settlement's physical remains.
We do not assume that one source type can answer every historical question.
3. Evaluating Source Reliability
A source is useful only when its relevance and limitations are understood.
When assessing a historical source, we aim to consider several factors.
Provenance: Where did the document, photograph, or account originate? Can its creator, date, or institutional source be identified?
Contemporaneity: Was the source created during the event, shortly afterwards, or many years later?
Purpose and perspective: Was the material created for administration, journalism, personal recollection, military planning, political persuasion, or another purpose?
Direct relevance: Does the source directly support the claim, or does it merely mention a related subject?
Corroboration: Is the information supported by other credible evidence, preferably evidence that does not simply repeat the same original account?
Limitations: What might the source omit, misunderstand, or fail to establish?
These considerations do not automatically make a source reliable or unreliable. They help us understand what the source can reasonably tell us.
An official document can contain mistaken assessments. A personal memoir can preserve valuable details while reflecting imperfect memory. A contemporary newspaper may document what was reported at the time without proving that every report was correct.
We therefore aim to evaluate evidence in its historical context.
4. Primary and Secondary Sources
We distinguish between primary sources and secondary sources because they serve different research purposes.
Primary Sources
Primary sources are materials created during the period under investigation or by people and institutions directly connected to the events.
Examples may include original correspondence, government files, photographs, court records, diaries, military reports, and contemporary newspapers.
They can provide direct evidence, but they may also be incomplete, biased, mistaken, or open to interpretation.
Secondary Sources
Secondary sources interpret, analyze, or reconstruct historical events using available evidence. They may include scholarly books, academic articles, historical biographies, and carefully documented research.
These sources can help establish context, understand competing interpretations, and identify original documents that warrant further examination.
Where practical, we aim to use secondary research to guide us towards relevant primary evidence rather than treating a secondary account as automatically conclusive.
When original records are inaccessible, we may rely on credible secondary sources while being careful not to imply that we personally examined documents we have not seen.
5. Cross-Checking Important Claims
A central historical claim deserves closer scrutiny when it materially affects the meaning of an article.
Where practical, we compare relevant accounts, examine the sources they cite, and look for independent evidence that supports or challenges the claim.
For example, a reported wartime event may be examined through contemporary reporting, official records, personal accounts, and later historical studies.
An alleged historical crime may require distinguishing the original accusation from the evidence presented in court and the eventual legal outcome.
A mystery involving an abandoned city may require comparing historical references with archaeological findings and credible specialist research.
The number of websites repeating a claim is not, by itself, proof of independent confirmation. Several websites may rely on a single report or copy information from one another.
When independent corroboration is unavailable, we aim to describe the evidence and its limitations accurately.
6. Researching Hidden History and Historical Mysteries
Our interest in hidden history and historical mysteries reflects a desire to examine overlooked subjects and unanswered questions.
However, a claim is not established merely because it is unusual, controversial, or rarely discussed.
For these subjects, we aim to investigate:
The earliest identifiable source of the claim.
Whether the original evidence survives or can be accessed.
Whether later accounts accurately represent the original material.
Whether credible researchers offer alternative explanations.
Whether the available evidence supports a firm conclusion.
What remains uncertain or cannot currently be verified.
We distinguish between a documented event, a plausible interpretation, an allegation, a historical legend, and a theory that lacks sufficient supporting evidence.
We do not assume that a lack of surviving documentation proves that an event was deliberately concealed.
Where a question remains unresolved, we aim to explain why the evidence does not yet support a definitive answer.
7. Researching Historical Crimes and Investigations
Old criminal cases require particular care because accusations, investigative theories, and legal findings are not interchangeable.
Where relevant and available, we may examine court records, official investigation documents, contemporary newspapers, credible biographies, and established historical research.
We aim to distinguish among:
An allegation or initial suspicion.
An investigative lead or theory.
A formal charge.
Evidence presented during legal proceedings.
A court finding, conviction, or acquittal.
Questions that remain unresolved.
A person should not be described as guilty merely because they were suspected, accused, or investigated.
We also consider the limitations of historical investigations, including missing evidence, incomplete records, contemporary prejudices, and the possibility that later accounts may have misrepresented earlier findings.
Our aim is to explain the available evidence without turning uncertainty into an unsupported accusation.
8. World War and Cold War Research
Military history, intelligence operations, and international conflicts frequently involve incomplete records and competing accounts.
For World War I, World War II, and Cold War subjects, potential research materials may include military archives, diplomatic correspondence, operational records, declassified intelligence documents, official histories, contemporary newspapers, personal papers, and scholarly research.
We consider the circumstances in which such records were produced.
An intelligence assessment may record what an agency believed at a particular time rather than what was ultimately proven. A wartime report may have been incomplete, based on limited information, or influenced by operational objectives.
Declassification makes a document accessible under particular conditions; it does not automatically make every statement within it accurate.
Where practical, we compare significant claims with other relevant records and identify important limitations in the evidence.
9. Historical Photographs and Archival Materials
Photographs and archival documents can provide valuable historical evidence, but their authenticity, context, and rights status must be considered separately.
Potential sources include public archives, government collections, museums, libraries, historical newspapers, Wikimedia Commons, and other repositories.
Where relevant, we aim to examine:
The original source or collection.
The photographer, creator, or institution, where identifiable.
The date and location, where established.
The original caption and any later changes to it.
Whether the image genuinely depicts the event or subject described.
The stated copyright status or applicable licence.
Any attribution or reuse requirements.
An image appearing on Wikipedia or Wikimedia Commons is not automatically free of copyright restrictions. Each file must be assessed according to its own source information and licence.
We also recognise that a photograph may have been misdated, miscaptioned, or reused in a different historical context.
Where the available evidence does not establish an image's exact origin, we aim to avoid presenting uncertain details as verified facts.
10. Public-Domain and Creative Commons Materials
We may use historical images, maps, documents, and other materials that are identified as public domain or made available under licences that permit the intended use.
Before publication, we aim to review the available rights information and follow applicable conditions, including attribution and licence requirements where necessary.
Copyright rules differ between countries, and an item that is public domain in one jurisdiction may not have the same status everywhere.
Likewise, the fact that a document is accessible through an archive does not automatically permit unrestricted reproduction or commercial use.
Where a source's copyright status or permitted use cannot be established with sufficient confidence, we may seek additional information or choose another resource.
11. Use of Wikipedia and Online Research Tools
Wikipedia and other online reference resources may help identify names, dates, terminology, bibliographies, and possible research leads.
However, we do not treat a general reference page as automatic confirmation of every historical claim.
Where a claim is important or disputed, we aim to examine the references cited by the page and, where practical, trace them to original documents, credible research, or authoritative collections.
Search engines and digital research tools help locate material; they do not independently establish its accuracy.
We aim to evaluate the underlying evidence rather than relying solely on a search result, summary, snippet, or repeated online statement.
12. AI-Assisted Research and Digital Tools
Digital tools, including AI-assisted systems, may be used where appropriate to organise research, identify possible references, assist with transcription or translation, improve readability, or prepare illustrative material.
Such tools may produce incorrect summaries, inaccurate references, misleading interpretations, or fabricated details. Their output is not treated as a substitute for source verification.
Important historical claims and references should be checked against available source material before they are presented as established facts.
AI-generated illustrations and reconstructions are not historical evidence. Where relevant, we aim to distinguish them from authentic archival photographs or original documents.
We do not consider a claim verified merely because an AI tool, search engine, or automated system repeats it.
13. From Research Notes to a Published Article
Once relevant material has been gathered, we aim to organise it into a coherent historical account.
The process may involve:
Defining the central question and scope of the article.
Identifying potentially relevant sources.
Examining the origin and limitations of important evidence.
Comparing accounts and investigating material discrepancies.
Separating established facts from interpretations and unresolved claims.
Preparing an original explanation with appropriate historical context.
Reviewing significant names, dates, quotations, and references.
Checking image attribution and relevant usage conditions.
Revising the article when the evidence requires greater qualification or correction.
Not every subject requires the same depth of investigation, and access to historical records varies. This framework describes our intended research approach rather than a guarantee that every article has undergone identical checks.
14. Citations and Source Transparency
We aim to provide readers with enough source information to investigate important claims independently.
Depending on the article, references may include links to original documents, archival catalogue records, academic publications, official records, books, museums, or other relevant sources.
We prefer references that identify a specific source over vague statements such as “historians say” or “official records prove” without supporting details.
Where possible, we aim to link to the source itself rather than only to another article discussing it.
Some records may be available only through physical archives, paid publications, restricted collections, or databases that require registration. We cannot guarantee that every cited source will be freely accessible.
A citation should be relevant to the statement it supports. A reference to a general historical topic does not necessarily establish every detail in an article.
15. Handling Conflicting Interpretations
Historians may disagree about the causes, significance, or consequences of an event, even when they agree on many of the underlying facts.
When credible sources offer materially different interpretations, we aim to consider the evidence and context supporting those views.
We do not assume that all interpretations are equally well supported. The weight given to a claim depends on the quality of the evidence, the reliability of the sources, and the strength of the reasoning involved.
Where a disagreement cannot be resolved from the available evidence, we aim to identify the uncertainty rather than imply that a definitive answer has been established.
16. Corrections and Continuing Research
Historical research is not always final. New documents may become available, digitised collections may reveal previously inaccessible material, and established accounts may be revised.
If we identify a significant factual error, incorrect attribution, misleading citation, or unsupported statement, we aim to review the affected material and make appropriate corrections.
Readers are welcome to submit credible evidence or identify potential problems through our Contact Us page or by emailing casefile.historyworld@gmail.com.
Our Corrections Policy explains how we review and respond to correction requests.
17. Limitations of Our Methodology
No research method can guarantee that every historical fact has been discovered or that every surviving source is accurate.
Some records have been lost, destroyed, altered, or never created. Others may remain inaccessible, and some questions may not have enough surviving evidence to support a definitive conclusion.
Our articles reflect the material available to us at the time of publication and may be revised when credible new information warrants a change.
We aim to communicate these limitations honestly and avoid presenting the absence of evidence as automatic proof of a particular theory.
18. Our Commitment to Readers
Case File History aims to make historical research engaging without losing sight of evidence, context, and uncertainty.
We value original editorial work, credible sources, careful interpretation, transparent attribution, and a willingness to correct substantiated mistakes.
Our objective is to help readers explore the past, examine historical claims critically, and understand the difference between what the evidence supports and what remains unknown.
For further information, readers may also consult our Archives & Sources, Editorial Policy, and Corrections Policy pages.
Contact Us
For questions about our research approach, source suggestions, or concerns about a published historical claim, please contact:
Case File History
Email: casefile.historyworld@gmail.com
Where possible, include the relevant article URL and supporting source information so that we can understand your enquiry.
Case File History — Investigating the past through sources, context, and evidence.