In the criminal law, a conspiracy is an agreement between natural persons to break the law at some time in the future, an, in some cases, with at least one overt act in furtherance of that agreement. There is no limit on the number participating in the conspiracy and, in most countries, no requirement that any steps have been taken to put the plan into effect (compare attempts which require proximity to the full offence). For the purposes of concurrence, the actus reus is a continuing one and parties may join "the plot" later and incur joint liability and conspiracy can be charged where the co-conspirators have been acquitted and/or cannot be traced. Finally, repentance by one or more parties does not affect liability but may reduce their sentence.