Ask a dozen retailers "What is merchandise planning?" and  you will get at least a dozen different definitions. This is because it can be  difficult to limit, and therefore to define, its scope. If we are going to  create a short definition of the term it will have to be a generalised one. That  way we can apply it to the whole range of activities that our twelve experts  would include.
Merchandise  Planning then is "A systematic approach. It is aimed at maximising return on  investment, through planning sales and inventory in order to increase  profitability. It does this by maximising sales potential and minimising losses  from mark - downs and stock - outs."
That  gives us a broad-brush definition. Let's now take a look at these ideas in  detail. 
It  is a "systematic approach" in many ways. You need the systems to ensure that you  have the right people, the right processes and the right computerised support.  Without the people and processes you will get nowhere. The software available is  merely an enabler - the final piece of a jigsaw.
It  is "aimed at maximising return on investment", but where is this investment  made? Most obviously we are talking about a financial outlay in stock, but less  evidently there is also considerable financial investment in retail space,  people and corporate infrastructure. Again, whilst financial investment is the  most obvious type, we should not overlook the "opportunity cost" of the  investment in time that is required by planning.
We  achieve the goals "through planning sales and inventory". These two elements are  inextricably linked and finding an optimum balance is the key to retail success.  We are doing more here, though, than merely calculating a purchase quantity. We  need to balance carefully the requirement to support sales with the constraints  and tensions imposed by store layouts and warehousing and transportation issues.  
We  put the effort into Merchandise Planning "in order to increase profitability".  Profitability is the key driver of most businesses.  Effective merchandise planning delivers  margin increases directly to the bottom line. We achieve the increase in  profitability "by maximising sales potential and minimising losses from mark -  downs and stock - outs". There are two major areas of profit leakage in retail.  Firstly lost sales resulting from lack of stock and secondly forced margin  reductions due to excessive stock. 

