How to Write Investigation Reports That Hold Up

Write an investigation report in seven parts: assignment, methods, evidence, factual record, findings, limitations, and exhibits. For each finding, show the exact evidence that supports it, name material conflicting evidence, and record what you could not verify.

Use the template below for a private investigation, workplace inquiry, insurance matter, background matter, or other fact-finding assignment. If your client, agency, court, or regulator requires a form, use that form first.

Use This Investigation Report Template

Copy this into your case file before you draft. Fill it from your notes, source records, and exhibits, not from memory.

INVESTIGATION REPORT

Case or matter:
Case number:
Prepared for:
Prepared by:
Report date:
Investigation period:
Distribution instruction:

1. ASSIGNMENT AND SCOPE
Assignment received:
Question or questions to answer:
People, locations, dates, and records included:
Matters outside scope:
Client instruction, policy, or authority followed:

2. METHODS
Actions taken:
- Records reviewed:
- Interviews conducted:
- Observation or surveillance conducted:
- Public-source research conducted:
- Other work completed:

Material actions and dates:
Records, people, or sources requested but unavailable:

3. EVIDENCE AND SOURCE REGISTER
E-01
Item or source:
Type:
Obtained from or observed by:
Date and time obtained or observed:
What it is:
Storage location or exhibit reference:
Preservation or handling note:
What it may confirm, challenge, or explain:

[Repeat for each material item.]

4. FACTUAL RECORD
Use labels in every material sentence:
[O] My direct observation or action
[S] A named person’s statement
[E] An exhibit, record, image, video, or other item
[A] Analysis or inference
[L] Limitation or unresolved gap

Date or issue:
What happened or was reported:
Source label and exhibit reference:
Confirmed, disputed, or unverified:

[Repeat for each material event or issue.]

5. FINDINGS BY ISSUE

Issue:
Question to answer:

Established facts:
- [Fact] Source or exhibit:
- [Fact] Source or exhibit:

Source statements and competing accounts:
- [Name and role] stated:
- [Name and role] stated:

Evidence supporting the finding:
- E-__

Evidence challenging or qualifying the finding:
- E-__

Analysis:
Explain how the identified record supports, challenges, or fails to resolve the issue.
Do not add new facts in this section.

Finding:
[ ] Supported by the available record
[ ] Not supported by the available record
[ ] Cannot be determined from the available record.

Reason:
State the evidence-based reason in one or two sentences.

Limitations:
State each missing record, unavailable source, restricted scope, or unresolved conflict.

[Repeat for each issue.]

6. CONCLUSION AND REQUESTED NEXT STEP
Answer the assignment question in plain language.
List recommendations separately, only if the assignment requested them.

7. EXHIBIT LIST
E-01:
E-02:
E-03:

The labels prevent a common reporting failure. A witness’s statement is evidence, but it is not automatically an established fact. Your analysis may explain what the statement means, but analysis should never appear as if you observed it.

1. Set the Assignment and Scope

Write the assignment in the client’s words. Then turn it into specific questions that your report can answer.

“Investigate possible theft” is too broad. “Determine whether the employee removed the listed inventory from the warehouse between May 2 and May 6” gives you a defined time, place, person, and issue.

State what falls outside the assignment. That boundary protects the reader from treating unanswered questions as overlooked questions.

A formal report should identify the authority, scope, limitations, witnesses, and important evidence. The VA report guidance uses those elements so a reviewer can understand the matter before reaching the findings.

2. Organize the Case File Before You Draft

Create four working documents before writing paragraphs:

1. An issue list, with one numbered question per issue.
2. An evidence register, with one stable exhibit number per item.
3. A chronology, with dates and times supported by the source.
4. A gap list, showing what you sought and why it remains unavailable.

Use an exhibit number that stays the same across your notes, report, and file. “E-04, parking-lot video received June 12” is traceable. “Security footage” is not.

Keep the five report lanes separate:

The CIGIE standards treat planning, execution, reporting, and information management as separate parts of quality investigative work. That structure helps you find missing work before a client finds it in the final report.

If an interview drives a material finding, document who attended, what the person knew firsthand, the important wording, and the unresolved points. Use our investigator interview guide to create a cleaner handoff from interview notes to the report.

3. Write the Factual Record Before the Findings

Draft the factual record first. Describe what each source shows, says, or fails to show without deciding the issue.

Write: “[S] Lee stated that the delivery arrived at 9:15 a.m. [E-02] shows a gate-entry record at 9:22 a.m.”

Do not write: “Lee gave an unreliable account.” That is analysis. Save the reasoned assessment for the findings section.

A factual finding should be specific about people, places, events, and times. It should also cite the exhibit that supports it. The VA handbook distinguishes those factual statements from conclusions that require interpretation or resolution of disputed evidence.

Use chronology when sequence decides the question. Use issue headings when the client needs answers to several separate questions. Complex reports often use both: a factual chronology first, then findings by issue.

4. Write Findings Without Overstating Them

Write each finding in four moves:

1. Restate the issue.
2. Name the material evidence.
3. Address the material conflict or gap.
4. State the calibrated finding.

For example:

Issue: Did the subject enter the storage room after 8:00 p.m. on May 6?
Finding: Supported by the available record. E-04 shows the subject entering at 8:14 p.m. E-05 shows the subject’s access card opening the storage-room door at 8:16 p.m. The subject stated that another employee used the card, but no record identified that employee or placed another person at the door.

Use only three outcome terms throughout the report:

• Supported by the available record: The material evidence supports the issue.
• Not supported by the available record: The material evidence does not support the issue.
• Cannot be determined from the available record: The material evidence does not resolve the issue.

Do not replace those terms with “obviously,” “clearly,” or “must have.” Those words add confidence without adding evidence.

The VA report standard requires conclusions on disputed issues to identify their basis and discuss material conflicting evidence. That is the discipline that makes a finding usable by the person who requested the work.

5. Handle Conflicting Accounts and Missing Evidence

State the precise point of conflict. Then state what each person or record says about that point.

Do not write “the accounts conflicted.” Write “Lee placed the meeting at 2:00 p.m.; Ramos placed it at 3:30 p.m.; E-07, the calendar invitation, lists 3:00 p.m.”

Resolve a conflict only when the record gives you a reason. Independent records, contemporaneous notes, consistent details, and direct observation may help. If the record does not resolve the conflict, say so.

Missing evidence belongs in the report when it could change the finding. Record what you requested, when you requested it, and why it was unavailable. The NIJ report guidance includes open investigative areas and limiting conditions as report content, not as details to hide in a working file.

For physical items, digital files, images, or client-supplied devices, record source, condition, storage, and each handoff. Our evidence training guide explains when preservation and documentation should lead to specialist referral.

6. Run the Evidence-To-Finding Check

Run this check after drafting and before submission:

• Every issue has a finding or a stated reason it cannot be determined.
• Every material fact has a source label or exhibit reference.
• Every direct observation is identified as your observation.
• Every source statement names the person and source of knowledge.
• Every material conflicting item appears in the finding.
• Every analysis sentence follows the factual record.
• Every limitation is stated where it affects the finding.
• Every exhibit number, name, date, and time matches throughout.
• The conclusion answers the assignment without adding unsupported claims.
• The exhibit list matches the materials attached or retained.

Review the report as if you are the next investigator assigned to the case six months later. That investigator should be able to locate each item, understand each decision, and identify each unfinished question.

Build Better Report-Writing Habits

A template improves consistency, but practice improves judgment. Keep one anonymous finished report as your personal quality benchmark. Compare each new report against it for structure, source attribution, and clarity.

At Learningshopusa, our self-paced 127. Report Writing course is an all-level, 4-hour course with an $80 course price. The course page lists 34 lessons, 4 assessments with 34 questions, and a certificate of completion after required work. For help selecting instruction around your actual casework gap, read our report-writing course guide.

FAQs

How Long Should an Investigation Report Be?

An investigation report should be long enough to answer the assignment and trace each material finding to the record. A narrow matter may need only a few pages and exhibits. A complex matter may need separate issue sections, a chronology, and a detailed exhibit list.

Should I Include Recommendations in an Investigation Report?

Include recommendations only when the assignment requests them. Keep recommendations separate from factual findings, because a recommendation is a proposed next action, not evidence. State the finding first, then identify the record that supports any requested recommendation.

Can I Use AI to Draft an Investigation Report?

Yes, but you must review every sentence against your actual record before using it. AI can help organize notes or improve plain language. AI cannot verify a witness statement, identify missing evidence, or make a finding for you.

What Should I Do If I Cannot Verify a Witness Statement?

State the witness’s account as a source-attributed statement. Then list the records, other witnesses, or observations that could confirm or challenge it. If no material corroboration exists, explain that the issue cannot be determined from the available record.