Http://teachingamericanhistory.org/lessonplans/act1/
this link should help you
A scoring rubric is an attempt to communicate expectations of quality around a task. In many cases, scoring rubrics are used to delineate consistent criteria for grading. Because the criteria are public, a scoring rubric allows teachers and students alike to evaluate criteria, which can be complex and subjective.
Setting goals helps trigger new behaviors, helps guides your focus and helps you sustain that momentum in life. Goals also help align your focus and promote a sense of self-mastery. In the end, you can't manage what you don't measure and you can't improve upon something that you don't properly manage.
I believe it is true because if speaker is too complex he/she would tend to lose the audience. Hope this is correct :)
Supply and demand! The prices will rise until the supply will reach the demand.