public static IEnumerable <ResultPack> EvaluateConcept(ConfigBase evalConfig, Period evalPeriod, IPeriodProfile evalProfile,
                                                               Result <MasterItem.EvaluateSource, string> prepValues)
        {
            IEmployProfile conceptProfile = evalProfile.Employ();

            if (conceptProfile == null)
            {
                return(EvaluateUtils.DecoratedError(CONCEPT_DESCRIPTION_ERROR_FORMAT, CONCEPT_PROFILE_NULL_TEXT));
            }

            MasterItem.EvaluateSource conceptValues = prepValues.Value;
            // EVALUATION
            TSeconds[] absencseMonth = PeriodUtils.ScheduleFromTimesheet(
                conceptValues.ScheduleMonth,
                conceptValues.SchedulePiece,
                conceptValues.ScheduleHours,
                conceptValues.DayFrom,
                conceptValues.DayStop);

            // EVALUATION

            IArticleResult conceptResult = new ArticleGeneralResult(evalConfig);

            // SET RESULT VALUES
            conceptResult.AddMonthAttendanceScheduleValue(conceptValues.DayFrom, conceptValues.DayStop, absencseMonth);
            // SET RESULT VALUES

            return(EvaluateUtils.Results(conceptResult));
        }