A defendant who intends to contest proceedings brought against him by a claimant must respond to the claim by filing an acknowledgment of service under Part 10 of the Civil Procedure Rules (CPR) and/or by filing a defence under Part 15 of the CPR. Acknowledgments of service are used if the defendant is unable to file a defence within the required time or if the defendant intends to dispute the jurisdiction of the court under Part 11 of the CPR. By acknowledging service a defendant is given an extra 14 days for filing the defence. In effect this means that the defendant has a 28-day period after service of the claim before the defence must be served. Once the defendant has returned the relevant section of the acknowledgment of service form, the court must notify the claimant in writing.