A lecturer assistant is expected to be professional when dealing with the score or decision. Being professional, the lecturer assistant will be constantly respected by the students. The lecturer assistant should be able to make use of the time to keep the disciplinary. Selecting and determining the lecturer assistant at Computer Science of Unika St. Thomas Medan are conducted by the phases of selecting and taking value of the test score, the semester of lecturer assistant candidate, the number of classes to be assisted, cumulative grade point achievement, and the score of the assisted course. The Method of Multi-Objective Optimization on the Basis of Ratio Analysis (MOORA) is in the part of Decision Support System introduced by Brauers dan Zavadkas. This method is the multi-objective optimization technique which is successfully applied to solve the various complicated decision-making and well-used in terms of lecturer assistant selection due to its simple calculation and easiness to understand.

Consumer demand for plastic bags to PT. Duta Plastic Industries often run out of stock. PT. Duta Plastic Industries in order to maintain consumer trust always maintain product availability and product quality in good condition. This study focuses on the problem of product inventory ordered by consumers. This study applies the exponential method to predict the amount of plastic production needs to meet customer demand. The results obtained from the research, among others, the number of forecasting the average demand for plastic bags brand No.1 at PT. Duta Plastic Industry in the period January 2018 to December 2018 is size 15 is 43.44 tons/month, size 19 is 37.36 tons/month, and size 24 is 25.43 tons/month. The average amount of raw material inventory per month that must be provided to meet the demand for sales of No.1 brand plastic bags during the period January 2018 to December 2018 which consists of three sizes is 115 tons/month.