Meetings are a common, yet often unproductive, part of the working day. Despite their frequent ineffectiveness, attendance remains widespread. This report identifies ten common cognitive errors that hinder productive meetings. These errors range from poor preparation and unclear objectives to a lack of defined roles and inadequate follow-up. The article offers practical advice on how individuals can improve meeting effectiveness. By addressing these pitfalls, organizations and employees in Germany can make better use of valuable time and resources. Ultimately, fostering a culture of efficient meetings contributes to improved workplace productivity across Germany.