Taha Selman CAKIR
030070023
2nd week

Random sampling:

Taking a sample from a population or lot in which each item has an equal change of being included in the sample. Thus, when taking samples from a large bin, the inspector should not take only those that happen to be within reach.

(Kalpakjian S., Schmid S.R., Manufacturing engineering and technology, Ed. 5th, p. 1121)

Manual assembly:

Manual assembly uses relatively simple tools and generally is economical for small lots. Because of the human hand and fingers and their capability for feedback through various senses, workers can manually assemble even complex parts without much difficulty. In spite of the use of sophisticated mechanisms, robots, and computer controls, the aligning and placing of a simple square peg into a square hole involving small clearances can be difficult in automated assembly-yet the human hand is capable of doing this simple operation with relative ease.

(Kalpakjian S., Schmid S.R., Manufacturing engineering and technology, Ed. 5th, p. 1180)

Acceptance quality level (AQL):

The acceptance quality level (AQL) commonly is defined as the level at which there is a 95% acceptance probability for the lot. This percentage indicates to the manufacturer that 5% of the parts in the lot may be rejected by the consumer (producer's risk). Likewise, the consumer knows that 95% of the parts are acceptable (consumer's risk).

(Kalpakjian S., Schmid S.R., Manufacturing engineering and technology, Ed. 5th, p. 1131)

Return on quality (ROQ):
Quality standards are essentially a balance between several considerations; this balance is also called return on quality (ROQ) and usually includes some limit on the expected life of the product.

(Kalpakjian S., Schmid S.R., Manufacturing engineering and technology, Ed. 5th, p. 1112)