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The construction of a desktop have ensure optimal arranging on a working surface of underlying hardware in view of its amount and design features (size video terminal and computer, pad, lectern etc.), character of executable operation. Construction of a working chair (seat) should ensure maintaining of a rational working pose at operation with video terminal and computer, allow to change a pose with the purpose of lowering static effort of cervical - humeral area muscles and spins for the warning of a fatigue development.

Working chair (seat) should be raise-rotary and regulated on height and angles of seat inclination and backrest, and also distance of a backrest from front edge of a seat, thus the regulation of each parameter should be independent, easily realized and to have reliable fixing. The surface of a seat, backrest and other units of a chair (seat) should be half-soft, be not slipping, not electrized and have air-permeable coverage providing mild clearing of contamination.

*Checkmarks*	*Parameters*	*Method of parameter measurement*	*Parameter value*
1	*Height of seat*	*from floor to the upper plane of seat*	*400-500 mms*
2?	*height of the pad (from a floor height)*	*from floor to the lower series of the pad*	*600-700 mms*
2b	*height of the pad (from level of desktop)*	*from base surface to the lower series of the pad*	*20 mms*
3	*angle pad inclination*	*from a horizontal plane*	*7-15°*
4	*width of the basic pad*	*is defined by an optimal zone of working field*	*up to 400 mms*
5	*the depth of the basic pad*	*Is defined by an optimal zone of a working field*	*up to 200 mms*
6	*distance from the pad to edge of desktop*	*from forward edge of desktop to the pad*	*more than 80-100 mms*
7	*height of the monitor*	*from a floor to the lower edge of monitor*	*950-1050 mms*
8	*Angle of monitor inclination*	*from a vertical plane*	*15°*
9	*distance from the monitor to edge of desktop*	*from forward edge of desktop to the monitor*	*500-700 mms*
10	*height of surface for a record*	*from a floor*	*670-860 mms*
11	*the area of surface for a record*	*is defined by an optimal zone of a working field*	*600 ? 400 mms 900 ? 600 mms*
12	*angle of inclination of a surface for a record*	*from a horizontal plane*	*0-10°*
*13?*	*depth of a leg room at a level of elbows*	*from forward edge of desktop*	*more than 400 mms*
*13b*	*depth of a leg area at a level by a foot*	*from a floor*	*more than 600 mms*
*14?*	*height of a leg area at a level of knee*	*from forward edge of desktop*	*more than 600 mms*
*14b*	*height of a leg area at a level by a foot*	*from a floor*	*more than* *100 mm*
*15?*	*width of a leg area at a level of knee*		*more than 500 mms*
*15b*	*width of a leg area at a level by a foot*		*more than 250 mms*
16	*height of a stand for legs*	*from a floor to a foremost part of a stand*	*50-130 mms*
17	*angle of inclination of a stand for legs*	*from a horizontal plane*	*0-25°*
18	*depth of a stand for legs*	*from forward edge of a stand to its(her) trailing edge*	*400 mms*
19	*width of a stand for legs*		*300 mms*
20	*stand for the documents*	*from a horizontal plane*	15-20°

Influence to health	Children and computer	Computer and vision	Electromagnetic radiations	Ionization of air
Reasons of malaises	Operation with keyboard	Sports exercises	Valid operating time	Ergonomics of workstation
Ergonomics of computer class	Resource of protection	Standards	Worker seat (chair) of user	Tco 99