This Practice Note provides an overview of commercial actions in the Court of Session. It provides guidance on what kind of cases fall within the definition of a commercial action and the potential benefits of adopting commercial procedure for appropriate cases. It explains how to start a commercial action, including pre-action considerations, the requirements of the summons and service of the summons. It also covers how to respond to the summons as a defender, how to transfer actions to or from the commercial roll, document disclosure/recovery, adjustment of pleadings and motions. The purpose and procedural requirements of the preliminary hearing and procedural hearing are described and the Practice Note explains how a substantive hearing (debate, proof or proof before answer) is fixed in a commercial action. For each type of hearing, the main procedural requirements are summarised including in relation to lodging documents and witness statements or authorities. It also summarises how to enforce the final decree (decision of the judge), how to appeal the judgment, and the position regarding expenses.