Besides, it also gives a good spread throughout the population size. However, a demerit is that a list is needed to begin which, in case it is desired to know the sample size and calculate the sampling interval. (Sampling Methods)
Other Quality Control (QC) Measures:
Tuff Tires should also follow the Quality Cost Delivery -- QDC approach to measure efficiency. Through the use of QDC there can be a focus to clarify the priorities for enhancing the production processed or service delivery. Simplicity gives a big picture, simplification of a complex production process and identification of unambiguous path for improvements. Feedback can also be used to measure the results of any changes that have been made to the production process or service delivery. QCD gives quick feedback -- it delivers the facts and figures required to arrive at meaningful decisions.
Another aspect is benchmarking, wherein QCD helps how well the business is presently performing to assist one to decide which component of the business or production process to improve. The data supplies a standard to set targets for the future. Once the company arrives at a decision regarding which activities to improve, it is required to review them, to establish why certain practices are performed in a particular manner.
NRFT can be put into figures by measuring the number of 'defective parts per million.' There are two points at which NRFT can be measured -- prior to it's reaching the customer internally and after it reaches the customer externally. For example if Tuff Tires produces 2 defective components per thousand, this makes 2,000 parts per million. The moment this figure is known by the company, Tuff Tires can set targets for improvement which can be below 100 parts per million which is the best practice for the industry. Irrespective of the industry any company is in, getting the things correct for the first time and repeating this every time results in a lower fault rate, thereby improving quality and customer satisfaction. (Quality, cost, delivery: Measuring business performance)
REFERENCES
"Sampling Methods" Australian Bureau of Statistics. Retrieved from http://www.abs.gov.au/websitedbs/D3310116.NSF/0/116e0f93f17283eb4a2567ac00213517?OpenDocument Accessed 24 August, 2005
"Quality, cost, delivery: measuring business performance" Retrieved from http://www.dti.gov.uk/bestpractice/assets/qcd.pdf Accessed 24 August, 2005
