Map what a witness personally observed
For interviewers, law students and litigation teams organizing a fact witness’s account.
How can you tell which part of a witness’s account comes from their own experience?
Break the account into individual assertions and ask how the witness knows each one. Put the observation, the conditions that made it possible and any later source in separate fields. Keep uncertainty in the witness’s own terms.
Begin with a free account
Invite the person to describe the event in their own words before showing a timeline or suggesting names. Then ask about their location, distance, line of sight, competing sounds, duration and what drew their attention. An apparent time can come from a clock, a routine, a later message or an estimate.
Use one row per assertion. Useful fields include the witness’s words, what they saw or heard, how they recognized the person or object, what they inferred and what they learned later. If they cannot place an event in a particular order, preserve the alternatives rather than assigning a sequence for them.
Look for changes in the source of knowledge
Someone who heard an alarm personally knows an alarm sounded. Their conclusion about its cause might come from another employee or a later incident report. Ask when and how each detail entered the account. Save the source reference separately so a reviewer can test it without changing the witness’s description.
Follow up on contradictions using open questions. Preserve both accounts with their dates and explanations. A statement that the witness does not remember is a usable answer. Do not fill a gap using a colleague’s recollection or the wording that best fits the case.
Know what the map establishes
Federal Evidence Rule 602 generally requires evidence supporting a finding of personal knowledge for fact testimony, which can come from the witness’s own account. The rule treats expert testimony under Rule 703 separately. This map helps identify a factual foundation and further questions. A judge decides evidentiary issues in the actual proceeding.
Worked example
Illustrative observation row. A warehouse worker recalls a truck leaving while they were at the loading door. They heard a bang but could not see its source. Later a supervisor said a forklift touched the truck. Record the departure as directly observed, the sound as directly heard and the contact as later reported. Leave the cause open and identify the supervisor as a possible separate source.
Primary sources
Related work at Agentic Attorney
This observation map is part of the shared Agentic Attorney resource collection. The main site describes AI implementation and consulting for legal teams. Explore Agentic Attorney’s approach to AI implementation.