(1)The Introduction should present first,with all possible clarity,the nature andscope of the problem investigated.
(2)It should briefly review the per-tinent literature to orient the reader.
(3)It should state the method of theinvestigation.If deemed necessary,the reasons for the choice of a par-ticular method should be stated.
(4)It should state the principal results ofthe investigation.
(5)It should state the principal conclusions suggestedby the results.