Personal Investigations
How to Choose a Private Investigator Responsibly
A practical guide to assessing scope, legality, confidentiality, reporting and professional standards before engaging an investigator.
Read guide →C3i Knowledge Hub
Clear guidance for high-stakes information decisions.
Practical, non-sensational guides explaining scope, evidence, limitations and responsible investigation decisions.
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Start with the information problem.
Personal Investigation Guides
Guides on verification, matrimonial enquiries, personal risk, scope and responsible investigation decisions.
Explore topic →Corporate Investigation Guides
Practical guidance on fraud, misconduct, due diligence, vendors and evidence-led corporate enquiries.
Explore topic →Digital Forensics Guides
Clear explanations of preservation, devices, email, metadata, chain of custody and technical limitations.
Explore topic →Security Consulting Guides
Risk, threat, security planning and executive-protection assessment guidance.
Explore topic →Evidence & Reporting Guides
Guidance on evidence integrity, documentation, limitations and decision-ready reporting.
Explore topic →Published guides
Cornerstone knowledge resources.
Personal Investigations
Pre-Matrimonial Investigation: Scope, Ethics and Expectations
Understand what a responsible pre-matrimonial investigation may verify, what it should avoid and how findings should be interpreted.
Read guide →Personal Investigations
Background Verification: Questions to Ask Before You Begin
A structured approach to defining relevant background checks, sources, consent, limitations and reporting.
Read guide →Corporate Investigations
The Corporate Investigation Process: From Allegation to Findings
A step-by-step guide to structuring corporate fraud, misconduct and integrity investigations.
Read guide →Corporate Investigations
Corporate Due Diligence Checklist for Higher-Risk Decisions
A risk-based checklist for assessing ownership, operations, reputation, litigation, relationships and representations.
Read guide →Corporate Investigations
Vendor Verification: What Organisations Should Check
A practical guide to verifying vendor identity, ownership, capacity, facilities, reputation and conflicts.
Read guide →Digital & Forensic Services
Digital Forensics Explained: Preservation, Examination and Limits
Understand digital evidence preservation, forensic examination, chain of custody, recovery limits and responsible interpretation.
Read guide →Digital & Forensic Services
How to Preserve Digital Evidence Before It Disappears
Immediate practical steps for protecting emails, devices, social media, logs and files before forensic review.
Read guide →Digital & Forensic Services
Email Header Investigation: What Headers Can Reveal
A clear guide to email routing, authentication, spoofing indicators, timestamps and important limitations.
Read guide →Evidence & Reporting
Chain of Custody: Protecting Evidence Integrity
Learn how evidence source, handling, transfer, storage and examination should be documented.
Read guide →Security Consulting
Threat Assessment: Questions a Good Assessment Should Answer
A practical framework for assessing threat actors, intent, capability, proximity, vulnerabilities and response priorities.
Read guide →Security Consulting
Security Risk Assessment: A Practical Framework
A structured guide to assets, threats, vulnerabilities, impact, existing controls and implementation priorities.
Read guide →Editorial standard: These guides provide general education and do not guarantee outcomes or replace legal, technical, medical, regulatory or financial advice.