In the packaging industry, as in any industry, it is sometimes necessary to perform tests of the validity of the product options. For packaging, the ideal tests would come from real world situations and many tests do. Of course, that is not always possible, which is why throughout the years, many standard tests have been developed and some have even been refined (which requires testing tests). ASTM International (formerly the American Society for Testing and Materials), ISO, militaries and other organizations keep track of these standard tests and suggest the standard approach for performing them. Many testing companies also add on to these standards or adjust them slightly for their own testing purposes.