This document discusses claims and variations that may occur in construction contracts. It defines a claim as a request for additional compensation or time due to occurrences beyond the contractor's control, such as differing site conditions or owner-caused delays. Claims can arise due to inaccurate owner-provided data, design changes after contract signing, or improper design. To succeed, contractors must prove entitlement and damages. The document also outlines types of claims against owners or contractors and strategies for claims prevention. It then discusses variation orders, which are written orders that change the contract scope through extra work, quantity adjustments or alterations.