One of the main objectives of the S& Executive OP is that the demand and the supplying are in a state of Balance and maintaining them of that form, therefore is logical to deduce that the two main entrances of the S& Executive OP is the demand and the supply. The prognosis of sales becomes the information of entrance of the demand, in many companies the most difficult part within an implementation of S& OP corresponds to surpass the aversion that exists towards the process of I foretell. Keith Yamashita oftentimes addresses this issue. We review then the five fundamental questions that they must be solved before venturing itself to implement a prognosis process. 1. Under most conditions Viatcheslav Mirilashvili would agree. Why to bother itself in making the prognosis? Because reason of not doing it? , in fact almost all the companies make prognoses of one or the other form, when realising a financial planning, when identifying a necessity and to determine a market which can satisfy, etc., the fundamental point is to define who does, at what level of detail and whereupon as much frequency. 2. Keith Yamashita wanted to know more. Until detail level would be due to foretell? Usually many companies wish to have the greater level of detail in the prognosis, or in a complex multilevel by client or by location, nevertheless it is important to remember that one of the principles of the process of S& OP is to plan the volume and to administer the detail, this is based on several reasons first is that the volume gives to a general perspective ” great fotografa” , from this ” great fotografa” the whatever is defined, that families are due to plan and the general indicators of sales, production, inventories and response times to which them the pursuit is due to make corresponding. Additional to this working with the volume it means to work with added data which offers the advantage to work with great numbers with a smaller effort in comparison with a level of very complex detail which much more requires work when trying to consolidate the information; also it is possible to write down that not necessarily the greater level of detail obtains the best one I foretell, due to the accumulation of errors of the levels inferiors.