| name | expert-report-class-damages |
| title | Expert Report on Class Damages |
| description | Drafts a litigation-ready expert report on class-wide damages for class action proceedings. Structures analysis to satisfy Daubert/FRE 702 admissibility and FRCP 23(b)(3) predominance. Use when retaining or preparing a damages expert for class certification, merits, or trial phases. |
| author | CaseMark |
| author_url | https://github.com/CaseMark/skills/tree/main/skills/legal/expert-report-class-damages |
| license | Apache-2.0 |
| version | 0.1.0 |
| execution_mode | open |
| jurisdiction | us |
| practice | litigation |
| language | en |
| tags | ["analysis","drafting"] |
Expert Report on Class Damages
Produces a court-ready expert damages report demonstrating class-wide measurability of harm under a common methodology, structured to survive Daubert challenge and support FRCP 23(b)(3) certification.
Prerequisites
- Class definition and complaint — allegations, liability theories, relief sought
- Engagement scope — retention letter specifying opinions requested and exclusions
- Damages evidence — transaction records, financial statements, pricing data, surveys, or defendant-produced databases
- Expert CV — credentials, publications, prior testimony history
- Opposing expert reports (if any) — to distinguish competing methodologies
- Legal authorities — jurisdiction's Daubert/Frye standard; prior rulings on proposed methodology
Quick Start
- Gather prerequisites above
- Confirm jurisdiction's admissibility standard (Daubert, Frye, or Sargon)
- Select primary damages methodology from the methodology table below
- Walk through each output section in order
- Run the compliance checklist before finalizing
Output Sections
1. Title Page
| Field | Content |
|---|
| Court & case caption | Full court name, case number, parties |
| Expert identity | Name, title, firm/institution |
| Retaining party | Plaintiff / Defendant / Neutral |
| Report date | Date of signing |
| Confidentiality designation | Per applicable protective order |
2. Introduction & Engagement Scope
- Identify the putative class, claims, and relief sought
- State questions addressed:
- Can damages be measured class-wide using common evidence?
- What is the aggregate class-wide damages amount?
- Do individual damages issues predominate over common ones?
- Explicitly state what is not in scope (liability, causation, individual allocation) to limit deposition exposure
3. Expert Qualifications
Tie credentials directly to the methodology used — generic backgrounds invite Daubert attack.
