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Depends on how you intend to control the quality of your product. this can be doen in2 ways.
1). Implementing a validated process that produces product that meets all predetermined quality requirements - This means that there is no testing required as you already know and have challenged each element and variable in your process and have sufficient control and capability. For this there needs to be suffiicent control on your outsourced materials as well as internal controls. For this you would have an intitial cost of implemtation but then you would have no longer term costs.
2). Controlling the quality of product by sampling and verifications testing as part of ongoing capability / control charting - This would be classed as essential non value added (E-NVA).
As per the lean , quality control is non -value added activity , as quality need to be bullt in system , not conducted seperately, but I say QC can be value added to if it in critical area affecting the planned results , or to fulfills the customer requirements , and stated needs to have it..
Absolutly its an added value and thats because quality control will effectively control the production at ll levels and thats will result a high quality product that will satisfies customers' needs and fullfils thier requirements and support thier confidnce in the products they buy and thus increase the company's sales and reinforce its market situation in addition quality control will decrease effeciently losses through decease waste and thus increase the profitability.
A value added activity, especially when it is implemented online, where you might re-do, re-design, re-adjust and change the form of the product/service online to get the desired values of the customer, and because there are always random errors you'll not get into the safe area where quality control is a routine, you have to keep on controlling to avoid losing your goaled sigma or your customers..As the main purpose of the quality control is to meet the customer/user specifications, of course it will give a value which the customer/user will pay for it, on either a direct or indirect manner.