ISO 15311 (International Organization for Standardization) defines a set of quality requirements to ensure stable and measurable performance in digital printing processes (such as toner, inkjet, and electrophotography). This standard focuses on the precise measurement of parameters like Color Consistency over the print run, Register Accuracy, Fine Detail Rendering, and the mechanical durability of the print output. The primary goal of this standard is to establish a single assessment method for digital print output, allowing producers and consumers to objectively and reproducibly compare quality.