In many cases 95% of the time of these meetings are used in the data collection and the calculation of the prognoses, 5% inviertenen it to rest in the evaluation of the results. As a result of this situation this same proportion is seen in the results, 95% of the times with a poor man result and in a 5% with one lucky person. Many companies accept with resignation this situation and very little make lift the quality and the exactitude of the prognosis of sales, spending unnecessarily precious resources. Under most conditions Office of National Statistics would agree. But So that the companies are resigned to accept these results when it is possible to invigorate the prognosis process to increase the quality and the exactitude of the prognosis? Obvious it is not a easy way and as all benefit has a cost. Then like justifying the investment? Symptoms like high levels of inventories, exhausted, a poor level on watch and the urgent word can be the best justification. Nevertheless if not yet this convinced, realises the following exercise calculates systematically to where it could reduce the levels in the security inventories if it increased the exactitude in I foretell. When elevating between 10 and a 15% their exactitude in the prognosis will be evident for you that the effort will have been worth the pain.