Guide
Proportionality In EDisclosure When Is Enough Enough
22 pages · 28 min read
Proportionality in eDisclosure is crucial for UK legal professionals.
- Costs and early case assessment
- Electronic disclosure practice
§ Guide
Proportionality In EDisclosure When Is Enough Enough
This guide explains how to determine when enough electronic disclosure is enough, balancing volume, cost, importance, technical difficulty, and evidential value.
Ref · E-D · 2026 · §LIBClass · ConfidentialJuris · England & WalesStatus · Active
Guide · 22 pages · 28 min read · Published 2026-08-30
Electronic disclosure, or eDisclosure, involves the identification, preservation, collection, processing, review, and production of electronically stored information relevant to litigation or investigations. The sheer volume of digital data often presents significant challenges, making it imperative to apply the principle of proportionality to ensure that the scope and cost of disclosure remain reasonable and justifiable. Without a clear framework for assessing proportionality, legal matters can become mired in extensive and expensive data exercises, leading to what the guide describes as 'estates without endings'.
This guide sets out a structured approach to understanding and applying proportionality in eDisclosure within the UK legal framework. It breaks down the concept into five core factors: the volume of data, the cost involved, the importance of the case, the technical difficulty of the disclosure process, and the evidential value of the information. By examining each factor in detail, the guide provides a comprehensive methodology for evaluating whether a proposed disclosure effort is proportionate to the needs of the case.
Practitioners can use this guide to develop a robust strategy for managing eDisclosure, both when requesting information from an opponent and when responding to such requests. It offers practical tools, including questions to ask clients, opponents, and eDiscovery providers, as well as suggested wording for proportionality paragraphs. The guide also addresses common mistakes, technical limitations, and provides worked examples to illustrate how to make and defend the 'stopping decision' - demonstrating when enough is truly enough in eDisclosure.
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§ Credit and source
Published by Computer Forensics Lab on 2026-08-30. Original material of the practice, free to read, cite and download. The authority behind this subject is EDRM, the Electronic Discovery Reference Model, which you should read alongside this guide. See every guide's author and source.
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PROPORTIONALITY · A GUIDE FOR UK LAWYERS Proportionality in e Disclosure: When Is Enough Enough? Volume, Cost, Importance, Difficulty and Evidential Value COMPUTER FORENSICS LAB DISCOVERY. UK
§ ABOUT THE AUTHOR PREPARED BY COMPUTER FORENSICS LAB E-DISCOVERY TEAM FULL CHAIN-OF-CUSTODY DOCUMENTATION
§ CONTENTS In this guide 01 Executive summary 02 The problem in plain English: estates without endings 03 The legal framework: proportionality every where 04 Factor 1 · Volume 05 Factor 2 · Cost 06 Factor 3 · Importance 07 Factor 4 · Technical difficulty 08 Factor 5 · Evidential value 09 Running the balance: the argument in practice 10 Proportionality as strategy, in both directions 11 The stopping decision: when enough is demonstrably enough 12 Worked examples 13 Common mistakes and technical limitations 14 Questions to ask · Suggested wording 15 Checklist and red flags · When to involve a digital forensic expert 16 Frequently asked questions 17 Glossary · References · Disclaimer · How a specialist laboratory can assist
§ 01 · ORIENTATION Executive summary THE HEADLINE ANSWER: WHENISENOUGHENOUGH?
§ 02 · FIRST PRINCIPLES The problem in plain English: estates without endings
§ 03 · THELAW The legal framework: proportionality every where
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§ 04 · FACTOR1 Volume
§ 05 · FACTOR2 Cost
§ 06 · FACTOR3 Importance
§ 07 · FACTOR4 Technical difficulty
§ 08 · FACTOR5 Evidential value
§ 09 · METHOD Running the balance: the argument in practice ELEMENT CONTENT 2 · The cost side, itemised Provider-quoted collection, processing, hosting and review figures for the increment, with 3 · The value side, sampled Measured richness, uniqueness against existing sources, and the issue-level significance 5 · The proportionate What you offer instead: preservation, sampling, a staged trigger, a targeted Model C, 6 · The record The cooperation history on this increment: what was exchanged, offered and refused,
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§ 10 · BOTH DIRECTIONS Proportionality as strategy, in both directions
§ 11 · THEEND The stopping decision: when enough is demonstrably enough
§ 12 · IN THE WILD Worked examples EXAMPLE1 · THEARCHIVETHATSTAYEDONTHESHELF EXAMPLE2 · FORTYCUSTODIANSMEETARITHMETIC EXAMPLE3 · THEREQUESTINGPARTYWHOASKEDSMALLANDWON EXAMPLE4 · STOPPINGTHEREVIEWWITHANUMBER 0.5 per cent, the sampled items reviewed and assessed as duplicative of disclosed material. Review
§ 13 · WHEREITGOESWRONG Common mistakes and technical limitations Common mistakes Technical limitations
§ 14 · INTERROGATORIES & DRAFTING AIDS Questions to ask · Suggested wording Ask your client Ask your opponent Ask your e Discovery / forensic provider SUGGESTED WORDING · PROPORTIONALITY PA R AG RAPHFORTHEDRDORA SUBMISSION ( A DA PTPERINCREMENT ) SUGGESTED WORDING · CHALLENGINGANUNEVIDENCEDBURDENOBJECTION
§ 15 · QUICK CONTROL Checklist and red flags · When to involve a digital forensic expert The proportionality checklist Red flags When to involve a digital forensic expert
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§ 16 · COMMON QUESTIONS Frequently asked questions Is proportionality just about money? Can we refuse to search a source simply because it is expensive? Who bears the burden on a proportionality dispute? Does proportionality ever excuse not disclosing a known adverse document? How does proportionality work in smaller claims? The court ordered more than we think proportionate. Now what?
§ 17 · REFERENCE Glossary Sources and authoritative references DISCLAIMER
§ HOW A SPECIALIST LABORATORY CAN ASSIST Working with Computer Forensics Lab Speak to a forensic examiner, not a salesperson. INSTRUCTTHELAB NEWENQUIRIESEMAILE - DISCOVERY
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