public static void MergeCoverage(this StudyUnit curStudyUnit, StudyUnit newStudyUnit)
        {
            //Merge of the study range is different for each part
            Coverage newCoverage = newStudyUnit.Coverage;
            Coverage curCoverage = curStudyUnit.Coverage;

            //1. Topical Coverage
            CheckOption.Merge(newCoverage.Topics, curCoverage.Topics);

            //2. Keyword
            curCoverage.Keywords.AddRange(newCoverage.Keywords);

            //3. Temporal Coverage
            curCoverage.DateRange = newCoverage.DateRange;

            //4. Geographic Levels Covered
            CheckOption.Merge(newCoverage.Areas, curCoverage.Areas);

            //5. Description
            curCoverage.Memo = newCoverage.Memo;
        }