The invention relates to a method for cutting and / or machining a workpiece (1) by means of a pressurized pulsating fluid jet (2), in which a device is used which has a receiving device (8) for receiving the workpiece (1) and a nozzle (9 ) for delivering the pressurized pulsating fluid jet (2). According to the invention, the fluid jet (2) is characterized for quality assurance in a processing break with the aid of at least one measuring and / or signal sensor (3) and the device is calibrated in the event of a deviation from a reference value. The invention also relates to a device for cutting and / or processing of a workpiece (1) by means of a pressurized pulsating fluid jet (2) which is suitable for carrying out the method.
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