. . , , , ; - , , . , (Glew, O'Leary-Kelly, Griffin & Van Fleet, 1955, . 395).
, (PDM) , , , . , , , . , , .
(Stewart, 1995) Variety, - , . . , , :
... : . , . , . , . . . , , : .
. , Springfield ReManufacturing Corporation , . , , . , . , , . International Harvester .
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, , , , , , . , , . , PDM , , - (, Locke & Schweiger, 1979).
(Cotton et al., 1988) , , , , , . , , , , .
400 , , : 1) /; 2) /; 3) ; 4) ; 5) /. , , PDM, . , , PDM .
, . , PDM . , , . : , , . , , , , .
, , (, Cotton, 1995; Cotton, Vollrath, Lengnick-Hall & Froggatt, 1990; Leana, Locke & Schweiger, 1990; Ledford & Lawler, 1994; Sagie, 1994, 1995; Wagner, 1994). . -, - ? -, , ? : , -, ( & Belohlav, 1995).