In other words, in a stool study the questionnaire is reliable, and the dependent variables can be separately analyzed and compared to predict which chair is most suitable. The rating scale give users a perspective about what they are studying by asking test subject to rate the stimuli on a Likert scale or in a visual analogue. Kolich found out that opinions are not just opinions liked by users, but they are indicators of specification and comfort requirements. Possible observer bias, fake questionnaire, and hard scoring scales are essential when using subjective methods. Since subjective method is difficult to quantify and objective method do not reflect the user point of view on the product, instrument or system, both criteria should be used to provide different view on the product or product event. DESIGN RECOMMENDATION. Fasan and Haslegrave (1996) suggested that sitting comfort is dictated by the combinations of chair, user and activity interaction. Vink (2005) suggests that for an ideal chair design, these should not just be comfortable, but also allow consumers to feel immediately comfortable during the siege period. The most commonly refered standards are the military standards for general design of systems, equipment and tools. These standard include anthropometric measurement such as height, depth, width, head, foot, hand and weight of men and women in the fifth and ninth percentile for the project, but are not just limited to monitors, locks, control, vehicle, workstation, physical environments and virtual environment.
Surname 9 Criteria for vehicle’s design, in particular for seats, are such that Seats should be designed with an angle of 5 to 8 degrees, the possibility of vertical and horizontal adjustment, the cushion should not limit the flow of blood to the legs or, so that this additional pressure on the lower extremities has a percentage of 5 to 95 and durable material padding with good air circulation to minimize discomfort in certain environs; and an integrated leader for leaders' support (Ministry of Defense, 2012). There is a design criteria for workstations, especially for seated workers. The dimensions of the armrests, backrest and seat cushion are fitted with possible seat adjustable. The seat height, depth and backrest angle must be adjustable. The defaults recommend adjusting a file's space, height, and width. However, a beam must be defined in length, width and space, but must have an adjustable height. Although these rules are applicable generally, it is necessary to take into account the work requirements, the population for which the chair was designed, and the environment in which it was designed to maximize work performance and reduce pain. (Kroemer et al., 2001). Although military standards are widespread, forces create them for reasons of functionality, not necessarily for reasons of comfort. Keegan recommended the basic elements necessary to ensure safety and comforts in the seats. They are based on the physiological, anatomical and pathological causes of back discomfort. The one and the most crucial requirement is the
- Fall '19