Quality assurance of aseptic packaging should cover all factors from plant design up to the distribution of the products. To assure the sterility of the product there is a need for microbiological rapid methods besides the traditional microbiological methods. But before these methods can be applied, much investigation is needed. Furthermore, there is a need for nondestructive methods for on‐line detection of the package integrity and for controlling the quality of the product after preincubation.