Professor Offornze Amucheazi, SAN of the Nnamdi Azikiwe University Awka Nigeria and Osinachi Nwandem, Associate at ǼLEX in their article, Establishing Disruption and Loss of Productivity Claims in Construction Projects: What is Required of the Contractor, note that while contracts may entitle contractors to claim reimbursement on the grounds of disruption/loss of productivity when they incur additional costs, contractors have always found it challenging to prove disruption claims and secure reimbursement. The solution lies in a proper understanding of what disruption/loss of productivity is and what contractors must establish to validate their disruption claims. Professor Amucheazi and Nwandem analyse how to prove disruption claims against the background of COVID-19 pandemic. They review several decided cases and the various standard forms of contracts commonly used in the Nigerian construction industry including the FIDIC Red Book, the Federal Ministry of Works Standard Conditions of Contract (Road Works) in Nigeria, and the Federal Ministry of Works and Housing Standard Form of Building Contract in Nigeria, to come up with a practical guide to contractors, employers, and arbitrators.