The discoverability rule for limitation periods means that O plaintiffs need not take any steps to discover their rights to sue. O defendants are always liable to pay for losses after the plaintiff discovers the right to sue, even if that occurs far in the future. O the defendant must discover the claim before an action can be commenced by the plaintiff. the limitation period starts from the time the claim is discovered, even if that is later than the time when the claim arose, subject in some jurisdictions to a later, ultimate (final) limitation period. a limitation period may be extended by a judge provided any prejudice (harm) to the defendant can be compensated with an order for court costs or granting the defendant an adjournment