There are many places where one could obtain sales forecast
software. One could check sites such as Sales Force for purchasing
sales forecast software.
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sales forecast
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Roughly, a Sales Plan is your strategie for achieving sales
(purchases). A Sales forecast is an estimate at the beginning of a
time period of how much one expects to sell.
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Sales plan is prepared based on sales forecast which is from
previous experiance or on based on market research or intuition, an
estimate that how much sales will be required in future.