Mastering means producing an image of the final product for replication. This is done only after all testing, trialling and revisions have been carried out. Whether this is done inside the development house or by an outside pressing service, say, the following steps will be involved in preparing digital materials for the creation of the master. (Mastering analogue video for laserdisc production is not considered here.)

Usually, one or more test discs produced by the pressing service are returned for approval before replication of the full production run.