Explain how earned value management can be used to control costs and measure product performance and explain why you think it is not used more often. What are some general rules of thumb for deciding if numbers for cost variance, schedule variance, cost performance index, and schedule performance index are good or bad

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a manufacturer of printed circuit boards uses exponential smoothing with trend to forecast monthly demand of its product. at the end of december, the company wishes to forecast sales for january. the estimate of trend through november has been 200 additional boards sold per month. average sales have been around 1000 units per month. the demand for december was 1100 units. the company uses α = 0.20 and β = 0.10. make a forecast including trend for the month of january.