Person Most Knowledgeable Deposition in California: Sample Topics

A Person Most Knowledgeable deposition in California is taken by serving a deposition notice on an organization under Code of Civil Procedure section 2025.230, listing the topics for examination with reasonable particularity so the entity can designate one or more witnesses prepared to speak for it on each subject.¹ The designated witness, commonly called the PMK, testifies to the organization’s collective knowledge, not personal recollection, and the quality of the notice largely determines whether the deposition produces useful answers or bogs down in objections.

What a PMK Witness Is Actually Testifying To

A PMK speaks for the entity. The witness covers whatever the organization knows or could reasonably learn about the noticed topics, which is a wider duty than testifying to what one person personally saw or did. The organization picks the person best positioned for each topic. That can be an officer, a manager, a line employee, or someone outside the company who has been educated on the facts.¹ Different topics can go to different designees, so one notice sometimes produces two or three witnesses appearing on separate days.

The practical consequence for the entity: if the billing department holds records on a noticed subject, the designated witness has to be briefed on those records even if the witness works elsewhere in the company. Sending someone with only their own personal knowledge does not satisfy the rule.

Drafting the Deposition Notice

California requires that the notice describe each topic for examination with “reasonable particularity.”¹ That standard does real work. Vague topics invite objections and give the entity cover to send an underprepared witness. Overly narrow topics can miss testimony you actually need. Each topic should be clear enough that the organization can identify the right witness and gather the right records.

Required Contents

Beyond the topic list, a PMK notice must include the standard deposition notice elements: it identifies the deponent (the entity), states the date, time, and location, and names the reporter or recording method. The notice can also require the organization to bring documents or categories of materials, including electronically stored information.² Pairing a document request with the PMK notice is common because it lets you question the witness about the very records the entity produces.

Timing: the notice must be served at least 10 days before the deposition.³ When document production is attached, serving with additional lead time gives the entity a realistic window to collect materials and prepare its witness, which cuts down on last-minute continuance fights.

What Reasonable Particularity Looks Like

Compare two versions of the same subject:

Too vague: “All facts regarding the plaintiff’s employment.”
Reasonably particular: “The policies and procedures in effect between January 1, 2023 and December 31, 2024 for investigating internal complaints of harassment at the Riverside facility, including any revisions to those policies during that period.”

The second version gives the organization a defined time frame, a specific location, and a clear subject. The first could mean hiring, salary, discipline, or termination, and meaningful preparation is impossible.

Sample Topics by Case Type

The topics below are illustrative and need to be tailored to the specific claims, entities, and time periods in your case. Pair every topic with a defined date range.

Employment Cases

The organizational structure and reporting hierarchy of the department where the plaintiff worked from [start date] to [end date].
Policies and procedures for investigating complaints of discrimination or harassment in effect during the relevant period, including training materials provided to investigators.
The facts and circumstances surrounding the plaintiff’s termination, including all persons involved in the decision and documents reviewed during the process.
Communications between human resources personnel and the plaintiff’s direct supervisors regarding the plaintiff’s job performance from [start date] to [end date].
The entity’s document retention policies applicable to employee personnel files and internal complaint records.

Business and Contract Disputes

The negotiation and execution of the agreement dated [date] between [plaintiff] and [defendant], including all drafts, proposals, and communications exchanged before signing.
The entity’s interpretation of Section [X] of the agreement and any internal discussions about its meaning or application.
All payments made or received under the agreement, including amounts, dates, and methods of payment.
The facts and circumstances that led the entity to declare a breach, including when the entity first became aware of the alleged breach.

Product Liability and Personal Injury

The design, testing, and quality control procedures for [product name/model] in place at the time of manufacture.
All complaints, warranty claims, or incident reports received by the entity concerning [product name/model] from [start date] to [end date].
The entity’s knowledge of any defects, hazards, or failure modes associated with [product name/model], including internal memoranda or engineering reports.
Post-incident investigation steps taken after the entity learned of the plaintiff’s injury.

Topics that overlap and ask for the same information in slightly different words waste time and invite objections. Draft each topic once, and draft it well.

How the Organization Can Push Back

An entity that receives a PMK notice with defective or overbroad topics has two main tools. The first is a written objection served at least three calendar days before the deposition, specifying the error or irregularity.⁴ If the objection is valid and the objecting party did not attend, the testimony taken that day cannot be used against that party.

For bigger disputes, the entity can move for a protective order before, during, or after the deposition. The court has broad authority to narrow the scope, prohibit inquiry into specific topics, set conditions, or block the deposition entirely.⁵ The moving party must show good cause and must include a declaration confirming an informal attempt to resolve the dispute.

Confidential and Trade Secret Testimony

PMK depositions often touch on trade secrets, proprietary processes, or sensitive commercial data. Section 2025.420 specifically allows the court to order that trade secrets or confidential research and commercial information not be disclosed, or be disclosed only to designated people or in a designated way.⁵ In practice this often produces “attorneys’ eyes only” designations for the most sensitive material. The party claiming confidentiality has to explain the need with enough specificity that the court can evaluate it.

Choosing and Preparing the Designee

The organization picks the witness. Seniority is not the point. What matters is the ability to absorb and communicate the entity’s collective knowledge on each topic. For a topic on IT security practices, a well-briefed systems administrator will usually testify better than a CEO with a vague overview.

Preparation is affirmative and mandatory. The entity has a duty to educate the designee on all information known or reasonably available to the organization on the noticed subjects.¹ That means reviewing documents, interviewing other employees, checking databases, and going through past correspondence. The PMK has to be ready to testify to the entity’s position and the facts behind it even when the witness only learned those facts during preparation. Producing an unprepared witness is one of the fastest ways to earn sanctions and a court order requiring a redo.

No Seven-Hour Cap

Standard depositions in California are limited to seven hours. PMK depositions are explicitly exempt. Section 2025.290(b)(5) carves out any deposition of a person designated under section 2025.230.⁶ Given the breadth of topics these depositions usually cover, that exemption fits the reality, but it also means the deposition can run into a second day. If it becomes unduly burdensome rather than simply long, a protective order limiting scope or duration is available.

Using the Testimony at Trial

PMK testimony is treated as the organization’s own words. An adverse party can use the deposition testimony of a PMK designee for any purpose at trial, and the entity cannot block it just because the witness is available to testify live.⁷ That is a real advantage for the deposing party. The testimony can be read to the jury to establish facts, contradict the entity’s other evidence, or lock the organization into positions that constrain its trial strategy.

The testimony also qualifies as a party admission under Evidence Code section 1220, so the hearsay rule does not block it when offered against the entity.⁸ The reverse is less friendly to the organization. When a PMK lacks personal knowledge and was simply educated for the deposition, the entity generally cannot use that testimony affirmatively to prove its own case.

Consequences of an Unprepared Witness

When a PMK cannot answer questions within the noticed topics, the deposing party can move to compel a properly prepared witness under section 2025.480. The court will impose monetary sanctions against the party whose conduct made the motion necessary unless that party shows substantial justification.⁹ The motion must be filed within 60 days of the deposition record being completed and must include a meet-and-confer declaration.

If the entity disobeys a court order compelling a prepared witness, the sanctions escalate. Section 2023.030 authorizes monetary sanctions covering the other side’s reasonable expenses and attorney fees; issue sanctions that treat specific facts as established or bar the entity from contesting certain claims; evidence sanctions barring the entity from introducing certain evidence; terminating sanctions that strike pleadings, dismiss the action, or enter default; and contempt.¹⁰ Courts usually work through these in order of severity, starting with money and escalating only when lesser remedies have failed. Producing a witness who genuinely cannot answer is treated the same as failing to respond to discovery at all.¹¹

If the Case Is in Federal Court

PMK practice under California law does not govern federal cases. The federal equivalent is Rule 30(b)(6). The framework is similar: reasonable particularity in topic descriptions, and an entity duty to produce prepared designees. Two differences matter. Federal Rule 30(b)(6) requires the parties to confer in good faith about the topics before or promptly after the notice is served, which California PMK practice does not require in the same form. And federal depositions keep the standard one-day, seven-hour limit unless the court or the parties agree otherwise, so the California exemption from the seven-hour cap does not carry over.

1
California Legislative Information. California Code of Civil Procedure CCP 2025.230
2
California Legislative Information. California Code of Civil Procedure CCP 2025.220
3
California Legislative Information. California Code of Civil Procedure CCP 2025.270
4
California Legislative Information. California Code of Civil Procedure CCP 2025.410
5
California Legislative Information. California Code CCP 2025.420
6
California Legislative Information. California Code of Civil Procedure CCP 2025.290
7
California Legislative Information. California Code CCP 2025.620
8
California Legislative Information. California Evidence Code EVID 1220
9
California Legislative Information. California Code CCP 2025.480
10
California Legislative Information. California Code CCP 2023.030
11
California Legislative Information. California Code CCP 2023.010