Hello selhnet,
it is a very big topic but a really good one.
Sales data analysis is the beginning of the whole business analysis.
It is the foundation of production budget.
The latter is to give you the basic information of direct material, direct labor and fixed overhead demand.
As you know we are competing in a dynamic world.
The sales couldn't be exactly as what you expected.
The key for the accuracy is sales forecasting.
There are a lot of ways to get the job done.
It is a branch of operation management.
Professional models are the tools for this job.
Supply chain analysis is another term for the identical process.
Its original point is material procurement, and its end point is beyond the entity's border (customer).
We may talk about business intelligence if you are really interested in this topic.
I hope this helps.
Thanks.
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