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I don't know for sure when the Navy evaluation system became mandatory but I can tell you that when I enlisted in 1965 they were mandatory at that time. In 1965 we were evaluated every 90 days.
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Research studies showing improved student behavior, discipline, and academic performance in schools where uniforms are mandatory would be the best evidence to support the claim for mandatory school uniforms.
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I do believe it is. It will definitely show up on a drug test which is mandatory in professional sport.
Bookkeeping and PerformanceIf you want to improve performance you have to control. To control the performance you should measure. Those things you can measure , you can control. Book keeping provides financial data to analyse performance and to control. More over for small and medium organisations it is mandatory to keep book of accounts.
An attribute allows you to customize the way a tag works and also specify the mandatory aspects of the tag. For example <Form name = "xxx" action = "yyy"> In the above tag, the name and action attributes are mandatory. You cannot identify the form without a name and you cannot know which place to submit the requests without the action.
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Education is mandatory in many countries.It is mandatory that you attend this meeting.