In Oklahoma, there are certain requirements for the number of copies of pleadings and motions that must be served. The type of service used depends on the type of document being served. Pleadings: The original and two copies of all pleadings must be filed with the court, and an additional copy must be served on all other parties. Motions: Original and two copies of all motions must be filed with the court, and an additional copy must be served on all other parties. Service of pleadings and motions may be effected in one of the following ways: • Personal service: This is the preferred method of service, and is used when a copy of a pleading or motion is delivered to the other party by the court clerk or by a process server. • Certified mail: This is a less preferred method of service, and is used when a copy of a pleading or motion is sent to the other party by certified mail, return receipt requested. • Service by publication: This is the least preferred method of service, and is used when a copy of a pleading or motion is published in a newspaper or other publication of general circulation in the county where the action is pending.