I've always felt that quality is directly related to customer service. Most mistakes happen when you are trying to deviate from the norm. If a customer is in a rush for a product or service that requires speed or special handling there is a much greater opportunity for mistakes to happen. Another reason quality suffers is that by trying to cut costs because of pricing issues, the product becomes inferior. Most businesses have checks and balances to make sure that whatever the product is it must be of a consistent quality.
Customers expect a certain level of quality in exchange for their hard earned dollar.
If you disappoint them too often they will leave. This section flies in the face of the previous section. Well, there are times when it's beneficial to your company to do so. Your competitors may be locked into certain procedures that can't be changed at the local level. The part to avoid is to increase quality control for this special order and not let it affect your normal procedures.