SOP’s are step by step procedure how to do something that is critical to quality ,safe operations and security.SOP involves procedure and work instructions .The correct level of details required depends on task complexity, level of detail increases with task complexity.If user become more experienced they do’t need to be reminded of all basics all time,level of details decreases .User’s high level of proficiency needs less of details.SOP goal is to ensure that user have enough information to complete the procedure without looking at other document.If SOP is too little ,user can’t perform their task correctl,If SOP is too much document seems too dense that nobody wants to use them.