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The three values are then multiplied together for each rule. This product provides a measure that can be used in prioritizing the application of the rules. These products range from 1 to 27. Rules and recommendations with a priority in the range of 1-9 4 are in considered to be level 3 rules, 106-18 9 are level 2, and 1912-27 are level 1. As a result, it is possible to claim level 3, level 2, or complete compliance with a standard by implementing all rules in a level. Recommendations are not compulsory and are provided for information purposes only.