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the extent to which a product fulfils its function over a period of time.

The reliability of a product depends upon its design characteristics, the quality of materials and components embodied within it and the care with which it is made and assembled.

A product's reliability is an important part of its performance in use and thus affects the appeal of the product to customers and the likelihood of their buying it. See BRAND LOYALTY. See QUALITY CONTROL, FAILURE RATE CURVE, PARALLEL SYSTEM.

References in periodicals archive ?
To estimate test-retest reliability for maximal voluntary isometric strength tests in shoulder IR and ER using FED, two identical test sessions were performed two weeks apart by the same trained tester.
In analogy with our previous study, the aim of the present study was to culturally adapt the COMBI to Dutch and to obtain measures of the validity and test-retest reliability of the Dutch translation [5].
This shows that the test and retest are correlated, and the test-retest reliability is safe.
Test-Retest Reliability and Homogeneity of the Modified Schutte Emotional Intelligence Scale Index AOE ROE ROOE UOE EIS Number of items 8 8 8 8 32 Test-retest reliability .74 (*) .70 (*) .69 (*) .71 (*) .84 (*) Internal consistency .78 .71 .70 .72 .88 reliability (Cronbach's [alpha]) Note.
The test-retest reliability was assessed by calculating intra-class correlation coefficient (ICC) which were interpreted as very low for ICC=0.25, low for ICC=0.26-0.49, moderate for ICC=0.50-0.69, high for ICC=0.70-0.89, and very high for ICC=0.90 (18).
Isokinetic dynamometry is also commonly used to assess lower limb strength and power and has consistently been found to elicit 'moderate' to 'excellent' test-retest reliability with ICC values between 0.71-0.99 tested over a range of velocities and muscle actions (Abernethy et al., 1995; Gleeson and Mercer, 1992; Li et al., 1996; Pincivero et al., 1997).
It was administered twice (Visit 1 and Visit 2), two to four weeks apart, to assess test-retest reliability. At Visit 1, participants also completed a demographic data form as an assessment of divergent validity.
For test-retest reliability, 65 patients completed the questionnaires, as a second time within seven days, at the same time of day, during a non-treatment period.
The test-retest reliability of the onset of concentric and eccentric vastus medialis obliquus and vastus lateralis electromyographic activity in a stair stepping task.
Excellent test-retest reliability was seen through an ICC of 0.98, range 0.91-0.97 for the five domains (Table 2).
In test-retest reliability, the Intraclass Correlation Coefficient (ICC) was calculated.