EIND 413 MSU Engineering Ergonomics and Human Factors Project

User Generated

xunyrqjjjj

Engineering

EIND 413

Montana State University

EIND

Description

  

Unformatted Attachment Preview

Ergonomics and Human Factors EIND413 Activity 3 DUE: 24 September 2019 Problem Select an office chair in which you spend a significant amount of time. It could be a chair at home, where you work, where you study, or anywhere else where you spend time. In addition, find another office chair different from the first chair. Use the attached Cornell Ergonomic Seating Evaluation form to evaluate each chair. The provide a no more than 2‐page, 1” margin, single spaced, 12 point font report that describes your findings. Include copies of your evaluation forms. CORNELL ERGONOMIC SEATING EVALUATION v21 ADMINISTRATION INSTRUCTIONS Background The seating evaluation v21 is designed as a practical guide to help practitioners make comparative design decisions about different ergonomic chairs. The form started life as a >50 item list that was compiled based on published literature on seating evaluation research studies. Through iterative use and analysis the form was revised to a 25 items version, and then a 15 item version. With advances in chair design the original evaluation form has been expanded to a 21 item form and the scoring process has been improved. This short evaluation form is still designed to be quick and easy to use by nonergonomists as well as ergonomists to help guide decisions about seating products. The content of the evaluation form is based on those questions that most differentiate between chairs (or sitting experiences) and those that relate to ergonomic design considerations. The form does not valuate design issues, such as color, style etc., nor does it cover esthetic or economic considerations, it only addresses those features of greatest ergonomic importance. How to score the evaluation form The form is to be used to compare different chairs rather than as an absolute evaluation tool. Say that 4 chairs are being compared, then each user would be allowed to sit in each chair for a specified period of time (it may be as brief as a few minutes, but this will limit some reactions, e.g. to seat pan comfort, and it is preferably that this is at least 90 minutes, unless the user really doesn’t like the chair). At the end of this test period for each chair the user then rates their experiences of sitting in that chair. The use of the 11 point scale is based on a 10cm linear rating scale design, but the defined intervals are given to speed the scoring process. The use of 11 points gives a true mid-point value of 5 that represents a us experience is average for the chair, and the extremes are the scale bipolar anchors with a minimum of 0 defined as unacceptable and 10 as exceptional on the same acceptability scale so that responses to all items can be directly compared. If a chair does not have a feature then it scores 0 on that item. The rating responses are subjective and the focus is on factors such as the usability and comfort of the chair. The scale is organized into 5 Separate sections (4 component sections: chair adjustments, seat comfort, ease of use, and body support, and 1 overall comfort rating section). The scores for each section are totaled and the section scores are summed and an overall % ergonomic design score is calculated. In this way different chairs can be compared either on individual items, on each of the 4 feature sections and on overall subjective performance, or the total chair performance is indicated by the % ergonomic design score (%EDS). CORNELL ERGONOMIC SEATING EVALUATION FORM v21 This form was revised and updated in 2007. The form can help you to evaluate the ergonomic design of a chair. You should answer each question by giving a rating out of 10, with higher scores indicating better performance. This form can be used as part of your chair evaluation process and to compare the designs of different chairs. You can copy this form without permission for noncommercial and educational purposes. If you have any questions or comments please contact Professor Alan Hedge at the Department of Design & Environmental Analysis at Cornell University (ah29@cornell.edu). Evaluator Name: _________________________________ Date: ____________________________ Chair Manufacturer _______________________________ Model ___________________________ Evaluation Criteria Marks out of 10 A: Chair Adjustments (are these available and how usable are they?) 1. Usability and range of seat pan depth adjustment Unacceptable(0) ----- Average(5) ---- Excellent(10) 0-1-2-3-4-5-6-7-8-9-10 2. Usability and range of back height adjustment while sitting 0-1-2-3-4-5-6-7-8-9-10 3. Usability and range of backrest recline adjustment while sitting 0-1-2-3-4-5-6-7-8-9-10 4. Arm support range of adjustability 0-1-2-3-4-5-6-7-8-9-10 5. Chair seat, back and arms adjust independently to allow comfortable sitting 0-1-2-3-4-5-6-7-8-9-10 A: Chair Adjustments Score = B: Seat Comfort Unacceptable(0) ----- Average(5) ---- Excellent(10) 6. Seat pan/cushion comfort (evaluate after at least 90 min. of sitting) 0-1-2-3-4-5-6-7-8-9-10 7. Seat edge contour comfort (no pressure points under buttocks, thighs, knees) 0-1-2-3-4-5-6-7-8-9-10 8. Backrest cushion comfort (evaluate at various recline positions) 0-1-2-3-4-5-6-7-8-9-10 9. Armrest comfort (when sitting back and resting arms) 0-1-2-3-4-5-6-7-8-9-10 B: Seat Comfort Score = C: Ease of Use Unacceptable(0) ----- Average(5) ---- Excellent(10) 10. Ease of chair seat height adjustment while sitting 0-1-2-3-4-5-6-7-8-9-10 11. Ease of seat pan depth adjustment while sitting 0-1-2-3-4-5-6-7-8-9-10 12. Ease of armrest height adjustment while sitting 0-1-2-3-4-5-6-7-8-9-10 13. Ease of backrest recline adjustment while sitting 0-1-2-3-4-5-6-7-8-9-10 14. Ease of cleaning chair parts and materials 0-1-2-3-4-5-6-7-8-9-10 C: Ease-of-use Score = D: Body Support Unacceptable(0) ----- Average(5) ---- Excellent(10) 15. Mid/Upper back support at various recline positions (no forward push or fall back) 0-1-2-3-4-5-6-7-8-9-10 16. Lumbar (low back) support (evaluate at various recline positions) 0-1-2-3-4-5-6-7-8-9-10 17. Seat pan support at various backrest recline positions 0-1-2-3-4-5-6-7-8-9-10 18. Armrest height support range (below thigh level to above seated elbow height) 0-1-2-3-4-5-6-7-8-9-10 D: Body Support Score = E: Overall Chair Experience Unacceptable(0) ----- Average(5) ---- Excellent(10) 19. Overall ease of use of the chair and controls (include training & adjustment time, # movements) 0-1-2-3-4-5-6-7-8-9-10 20. Overall appearance of the chair 0-1-2-3-4-5-6-7-8-9-10 21. Overall comfort of the chair 0-1-2-3-4-5-6-7-8-9-10 E: Overall Chair Experience Score = TOTAL % ERGONOMIC DESIGN SCORE (%EDS) = ((A+B+C+D+E)/210) x 100 = © Professor Alan Hedge, Cornell University, Oct 07 CORNELL ERGONOMIC SEATING EVALUATION FORM v21 This form was revised and updated in 2007. The form can help you to evaluate the ergonomic design of a chair. You should answer each question by giving a rating out of 10, with higher scores indicating better performance. This form can be used as part of your chair evaluation process and to compare the designs of different chairs. You can copy this form without permission for noncommercial and educational purposes. If you have any questions or comments please contact Professor Alan Hedge at the Department of Design & Environmental Analysis at Cornell University (ah29@cornell.edu). Evaluator Name: _________________________________ Date: ____________________________ Chair Manufacturer _______________________________ Model ___________________________ Evaluation Criteria Marks out of 10 A: Chair Adjustments (are these available and how usable are they?) 1. Usability and range of seat pan depth adjustment Unacceptable(0) ----- Average(5) ---- Excellent(10) 0-1-2-3-4-5-6-7-8-9-10 2. Usability and range of back height adjustment while sitting 0-1-2-3-4-5-6-7-8-9-10 3. Usability and range of backrest recline adjustment while sitting 0-1-2-3-4-5-6-7-8-9-10 4. Arm support range of adjustability 0-1-2-3-4-5-6-7-8-9-10 5. Chair seat, back and arms adjust independently to allow comfortable sitting 0-1-2-3-4-5-6-7-8-9-10 A: Chair Adjustments Score = B: Seat Comfort Unacceptable(0) ----- Average(5) ---- Excellent(10) 6. Seat pan/cushion comfort (evaluate after at least 90 min. of sitting) 0-1-2-3-4-5-6-7-8-9-10 7. Seat edge contour comfort (no pressure points under buttocks, thighs, knees) 0-1-2-3-4-5-6-7-8-9-10 8. Backrest cushion comfort (evaluate at various recline positions) 0-1-2-3-4-5-6-7-8-9-10 9. Armrest comfort (when sitting back and resting arms) 0-1-2-3-4-5-6-7-8-9-10 B: Seat Comfort Score = C: Ease of Use Unacceptable(0) ----- Average(5) ---- Excellent(10) 10. Ease of chair seat height adjustment while sitting 0-1-2-3-4-5-6-7-8-9-10 11. Ease of seat pan depth adjustment while sitting 0-1-2-3-4-5-6-7-8-9-10 12. Ease of armrest height adjustment while sitting 0-1-2-3-4-5-6-7-8-9-10 13. Ease of backrest recline adjustment while sitting 0-1-2-3-4-5-6-7-8-9-10 14. Ease of cleaning chair parts and materials 0-1-2-3-4-5-6-7-8-9-10 C: Ease-of-use Score = D: Body Support Unacceptable(0) ----- Average(5) ---- Excellent(10) 15. Mid/Upper back support at various recline positions (no forward push or fall back) 0-1-2-3-4-5-6-7-8-9-10 16. Lumbar (low back) support (evaluate at various recline positions) 0-1-2-3-4-5-6-7-8-9-10 17. Seat pan support at various backrest recline positions 0-1-2-3-4-5-6-7-8-9-10 18. Armrest height support range (below thigh level to above seated elbow height) 0-1-2-3-4-5-6-7-8-9-10 D: Body Support Score = E: Overall Chair Experience Unacceptable(0) ----- Average(5) ---- Excellent(10) 19. Overall ease of use of the chair and controls (include training & adjustment time, # movements) 0-1-2-3-4-5-6-7-8-9-10 20. Overall appearance of the chair 0-1-2-3-4-5-6-7-8-9-10 21. Overall comfort of the chair 0-1-2-3-4-5-6-7-8-9-10 E: Overall Chair Experience Score = TOTAL % ERGONOMIC DESIGN SCORE (%EDS) = ((A+B+C+D+E)/210) x 100 = © Professor Alan Hedge, Cornell University, Oct 07 EIND 413 Ergonomics & Human Factors Workplace Design & Seating Goals of Human Factors • Design Systems that – Reduce human error – Increase productivity – Enhance safety and comfort • Improve fit between human and machine and environment 1 Work Spaces • • • • • • Clearance Reach Adjustability Visibility Work Surfaces Component Arrangement Clearance • Provide access • Prevent awkward postures • Lower‐limit dimension – Adequate for largest user (start at 95th percentile) 2 Reach • Determined by capabilities of smallest user – 5th percentile • Reach envelope – Three‐dimensional space around person that can be reached without stretching or leaning forward – Represents reach capability of individual Adjustability • Adjust the workplace • Adjust the worker position relative to workplace • Adjust the work piece • Adjust the tool 3 Visibility and Line of Sight • Line of sight – Preferred direction of gaze when eyes are in resting condition – ~10‐15 degrees below horizontal plane Work Surfaces • Height – Standing • 2‐4 inches below elbow level – Seated • At elbow level • Depth – Reach envelope 4 Workplace Design Guidelines • Aim at dynamic work – avoid static work • Work surface height depends on size of worker and type of task • Avoid overloading the muscular system • Primary controls within the normal working area – Secondary controls within maximum working area • Strive for best mechanical advantage • Work with both hands • Hands should move in symmetrical and opposite directions • Use feet as well as hands Workplace Design Guidelines (cont.) • Design knowing the capacity of the fingers • • • • • • • – Do not overload Avoid unnatural postures Permit change of posture Maintain proper sitting posture Counterbalance tools > 3 pounds Accommodate large individual Use gravity, do not oppose it Use bins with lips for storage and manual retrieval of small parts • Keep eye fixations to a minimum • Train individuals in proper use of workspace facility 5 Office Ergonomics Occupational Risk Factors • There are four main risk factors people may experience when dealing with computer work • Even though risk factors may be present, this does not mean you are destined to suffer an injury • You will benefit from being aware of the risk factors and how to minimize the risk as much as possible 6 Risk Factors… 1. Repetition – task or series of motions performed over & over. 2. Forceful Exertions ‐ amount of physical effort required to complete task. 3. Awkward Postures ‐ reaching, twisting, bending, holding fixed positions. 4. Contact Stress – localized pressure exerted against the skin by external force. Health Risk of Workstation • Musculoskeletal Disorder. • Eye Strain. • Work Related Stress 7 Musculoskeletal Disorder Musculoskeletal Disorders (MSD’s) are injuries and disorders of the musculoskeletal system. They may be caused or aggravated by various hazards or risk factors in the workplace. A number of medical diagnoses are covered by the term MSD, including: • • • • • Carpal tunnel syndrome Epicondylitis (tennis elbow) Muscle strain Tension neck syndrome Back pain Source: http://www.safetyoffice.uwaterloo.ca/hse/ergonomics/musculoskeletaldisorders.htm Eye Strain More than 50 percent of computer users experience eyestrain, headaches, blurred vision and other visual symptoms related to sustained use of the computer. This type of stress on the visual system can also cause body fatigue and reduced efficiency at work. Direct Computer Stress Symptoms – – – – – headaches irritated and/or dry eyes blurred vision doubling of vision frequently losing place when moving eyes between copy and the screen Source: Dr. Marc Grossman. Computer Eye Strain: How to Relieve It. (http://www.visionworksusa.com/computereyestrain.htm) 8 Eye Strain Many computer users experience visual stress due to: 1) an increase in the number and complexity of necessary eye movements and focusing skills, 2) poor lighting conditions, glare and distracting reflections, 3) screen flicker rate, and 4) above all, the extended amount of computer use. Source: Dr. Marc Grossman. Computer Eye Strain: How to Relieve It. (http://www.visionworksusa.com/computereyestrain.htm) Work Related Stress Workplace stress is the harmful physical and emotional response that occurs when there is a poor match between job demands and the capabilities, resources, or needs of the worker.(Wikipedia) Physical effect of work related stress include: • Fatigue • Muscular tension • Headaches • Heart palpitations • Sleeping difficulties, such as insomnia • Gastrointestinal upsets, such as diarrhoea or constipation Source: http://www.betterhealth.vic.gov.au/bhcv2/bhcarticles.nsf/pages/work‐related_stress 9 The Workspace for Comfort Office Ergonomics 10 Neutral vs. Non‐Neutral Hand Positions Neutral Wrist Position ‐ Wrists and elbows are at the same height, parallel to the ground. ‐ No awkward postures. ‐ Everything within easy reach. ‐Wide or narrow shoulders? What does that do to your wrists? Do you need a split or contoured keyboard? Chair 1. Backrest height – adjust to support lumbar curve at correct level 2. Lumbar tension – adjust for comfort and to fit low back curve 3. Backrest tilt – adjust to sit upright; lock tilt control 4. Sit against backrest 5. Seat pan – supports thighs to just behind knees 6. Seatpan tilt – adjust so hips and knees are at same level 7. Feet – flat on floor or use footrest if chair height is raised 8. Arm rests – optional – Height and width adjustable – Positioned directly below elbows for support Safe Sitting Guidelines – Use a chair that fits you and is adjusted correctly – Don’t stay in one position for prolonged periods of time; get up and move or stretch every 20‐50 minutes – Make sure your feet are flat on the floor – Sit upright with back and shoulders against the backrest – Do not use armrests to slouch. Elbows and lower arms should only rest lightly to avoid contact stress. – Keep shoulders relaxed and slightly dropped while keyboarding 11 Chair Backrest • General Design 95120° – Easy to adjust – 5‐leg base ‐‐ stability Arm Rests – Swivel and wheels ‐‐ ease of reaching & Seat getting in & out Pan Source: Harvard School of Public Health Chair Design • Seat Pan: Backrest 95120° – Slightly concave – Softly padded Arm Rests – Rounded, waterfall edge‐ reduce edge Seat compression Pan Source: Harvard School of Public Health 12 Chair Design • Foot rest Backrest 95120° – only if necessary – should be big & solid • Backrest: Arm Rests – Supports entire back: head‐ lumbar ~ 85 cm Seat – Relieve spinal and musclePan load Source: Harvard School of Public Health Adjust the chair • Seat Height: Backrest 95120° – Feet flat on floor – Knee should be at 90° • Armrests: Arm Rests – Supports upper extremity – Adjustable vertically and Seat horizontally • Vertically for shoulders Pan • Horizontally to keep elbows in Source: Harvard School of Public Health 13 Seating Design Advantages of a Sitting Posture • Provides stability required in tasks involving high visual and motor control • Less energy consuming than standing • Places less stress on lower extremity joints • Lowers hydrostatic pressure on lower extremity circulation 14 The Vertebral Column Sitting Postures 15 Anthropometric Measurements Lumbar Support and Backrest Angle 16 Disc Pressure – Unsupported Sitting Disc Pressure vs Backrest Inclination & Lumbar Support 17 Armrest influence on Disc Pressure Disc Pressure – Simulated Work Activities 18 General Principles of Seat Design • • • • • Promote lumbar lordosis Minimize disc pressure Minimize static loading of back muscles Reduce postural fixity Provide for easy adjustability Case Study 1 – Aeron Chair 19 Aeron – Features and Benefits • Broad range of seat height adjustment allows its users to choose the forward-bias or semi-reclined position • Kinemat tilt mechanism allows the body to pivot naturally and simultaneously at the ankle, knees, and hips • Pellicle material distributes weight evenly over the seat and back, conforming to each person's shape. • Seat-height range - from a low of 14 3/8 inches (on the A-size chair) to a high of 20 7/8 inches (on the B and C sizes). • The forward-tilt adjustment positions the seat angle 5 degrees forward. • The lumbar pad can be adjusted vertically through a 4 1/2-inch height range. Depth can be set at 3/4 inch or 1 1/4 inches. • Armrests pivot inward 17.5 degrees to support forearms for keying, outward 15 degrees for mousing. • Arm heights adjust independently within a 4-inch range. Aeron – Adjustments 20 Aeron – Kinematics of Sitting Aeron – Anthropometric Approach 21 Aeron – Anthropometric Approach : 2 Aeron – Pressure Distribution 22 Case Study 2 – Leap Chair Leap Chair – “Live Back” • Spine does not move as a single unit • Chair’s back changes shape to support the independent movements of a person's upper and lower back when he or she changes posture • The upper and lower back regions require different amounts of support - Separate Upper and Lower Back Controls. - Adjust the upper back control to provide an increasing amount of force that increases as the user reclines. 23 Leap Chair – Features • Designed to enable people to recline without changing their orientation to their work • Seat glides forward, so you can recline without departing your Vision and Reach Zone • Seat Edge Angle Control Leap Chair – Features : 2 • Seat Height • Standard six inch seat height adjustment (15" to 21"). • Adjustable Seat Depth • People don't fit neatly into average sizes ("A," "B," "C"). • Adjustable seat depth (15-1/4" to 18-1/4"). • Adjustable Armrest 24 Case Study 3 – HumanScale Freedom Freedom Chair – Features • Single lever control – seat height • Arms move in tandem when you move forward • TechnoGel – spreads weight •“ It's like sitting in a puddle of your own flesh” •Counterbalance system •As you recline, your weight automatically balances the force required to recline the chair •Provides just the right amount of recline tension to keep you fully supported in all positions without the need for locks or other manual adjustments 25 CODE DESCRIPTION MEASUREMENT (in inches) a seat depth 16 - 19 b seat height adjust. range 16 - 21 * LOW OPTION 14 - 19 * HIGH OPTION 17 - 22 1/3 1/2 1/2 1/3 c base diameter 26 (diameter) d backrest width 21 e height, standard chair 33 - 41 * LOW OPTION 31 - 39 * HIGH OPTION 18 - 42 1/2 1/4 1/2 1/2 1/4 f seat width 21 g back rest height 5 h height, advanced chair 43 - 56 i stool height 16 - 21 1/2 Keyboard and mouse • Vertical Position – – – – As low as possible Arms parallel g‐h key height = elbow height mouse and keyboard at the same height – larger surfaces are better than trays Source: Harvard School of Public Health 26 Keyboard and mouse • Horizontal Position – Keyboard: Directly in front of worker – Mouse: Right or left of keyboard – Mouse: Directly in front (mouse intensive tasks) – Trays can limit horizontal adjustments Source: Harvard School of Public Health Keyboard and mouse • Angle – Keyboard: Flat or negative sloped • Keep wrists straight or slightly flexed Negative slope – Wrist pad (obstacles) can help (bio‐feedback) Flat Wrist pad Source: Harvard School of Public Health 27 Monitor Positioning • Vertically adjustable 18‐24” – Top of screen not to exceed the operator’s eye level (preferably 1‐2 inches below eye level) – Viewing angle 15°‐ 30° W/R to horizontal • Horizontally adjustable – Directly in front – 18‐24” distance • Same for document holder Source: Harvard School of Public Health Arranging Your Workspace Arrange tools around your desk so you minimize the distance you have to reach for them. Divide your work space into three zones: Primary work zone ‐ the distance from elbow to hand. Things you touch on a daily basis. Secondary work zone ‐ within arm's reach. Use this zone to position those items that you use frequently, but don't need all the time. Reference zone ‐ outside arm's reach. Use this zone for your least‐often used items. 28 Take Breaks! • Micro‐Breaks – Every 20‐40 minutes • From Stretching, by Bob and Jean Anderson, Shelter Publications 13. Wrists/Fingers 14 . Eyes ‐ Practice the 20/20/20 rule After 20 minutes of computer use: look away from the screen and focus on something 20 feet away that is out a window or down a corridor. Focus on this sight for at least 20 seconds. Workstation Environment Appropriately placing lighting and selecting the right level of illumination can enhance your ability to see monitor images and avoid awkward posture to see monitor. Ventilation and humidity levels in office work environments may affect user comfort and productivity. • Lighting • Glare • Ventilation Source: http://www.osha.gov/SLTC/etools/computerworkstations/wkstation_enviro.html 29 Lighting Potential Hazards: • Bright lights shining on the display screen "wash out" images. Straining to view objects on the screen can lead to eye fatigue. • Bright light sources behind the display screen can create contrast problems, making it difficult to clearly see your work • High contrast in computer screen, horizontal work surface, and surrounding areas cause eye fatigue and headaches. Source: http://www.osha.gov/SLTC/etools/computerworkstations/wkstation_enviro.html Lighting Possible Solutions: • Place rows of lights parallel to your line of sight (Figure ). • Provide light diffusers. • Provide supplemental task/desk • Use blinds on windows to eliminate bright light. • Reorient the workstation so bright lights from open windows are at right angles with the computer screen (Figure 1) Source: http://www.osha.gov/SLTC/etools/computerworkstations/wkstation_enviro.html 30 Glare Potential Hazards: • Direct light sources (for example, windows, overhead lights) that cause reflected light to show up on the monitor (Figure) make images more difficult to see, resulting in eye strain and fatigue. • Reflected light from polished surfaces, such as a keyboards, may cause annoyance, discomfort, or loss in visual performance and visibility. Source: http://www.osha.gov/SLTC/etools/computerworkstations/wkstation_enviro.html Glare Possible Solutions: • Place the face of the display screen at right angles to windows and light sources. • Clean the monitor frequently. A layer of dust can contribute to glare. • Use blinds or drapes on windows to help reduce glare • Tilt down the monitor slightly to prevent it from reflecting overhead light. • Use barriers or light diffusers on fixtures to reduce glare from overhead lighting. Source: http://www.osha.gov/SLTC/etools/computerworkstations/wkstation_enviro.html 31 Ventilation Potential Hazards: • Users may experience discomfort from poorly designed or malfunctioning ventilation systems. • Dry air can dry the eyes. • Temperatures above or below standard comfort levels can affect comfort and productivity. • Exposure to chemicals, volatile organic compounds, ozone, and particles from computers and their peripherals (for example, laser printers) may cause discomfort or health problems. Source: http://www.osha.gov/SLTC/etools/computerworkstations/wkstation_enviro.html Ventilation Possible Solutions: • Do not place desks, chairs, and other office furniture directly under air conditioning vents. • Keep relative humidity of the air between 30% and 60%. • The recommended ambient indoor temperatures range between 68° and 74° F during heating season and between 73° and 78° F during the cooling season. • Enquire about the potential for a computer or its components to emit pollutants. Those that do should be placed in well‐ventilated areas. • Maintain proper ventilation to ensure that there is an adequate supply of fresh air. Source: http://www.osha.gov/SLTC/etools/computerworkstations/wkstation_enviro.html 32 Summary • Avoid postures where you have to maintain non‐neutral positions. • Avoid extreme positions of body parts/joints. • If it doesn’t feel right, it’s probably not right. • Maintain proper sitting postures. • Keep an open mind! Web Resources • What is RSI and what can you to do to prevent it? (http://www.youtube.com/watch?v=agZe‐ tyj_1s) • Ergonomics: The Pen, The Mouse & Repetitive Strain Injuries (http://www.youtube.com/watch?v=aFCCultb yMM) • 7 Tips to Avoid Computer Vision Syndrome (http://corporatefitnessproducts.com/blog/20 09/09/7‐tips‐to‐avoid‐computer‐vision‐ syndrome/) 33
Purchase answer to see full attachment
Explanation & Answer:
2 pages
User generated content is uploaded by users for the purposes of learning and should be used following Studypool's honor code & terms of service.

Explanation & Answer

Attached.

REPORT
(Activity 3)

Date :
Evaluator Name :
Submitted to :

According to the given assignment, I evaluated two office chairs. One is SmugChair 1388
manufactured by Smugdesk and other is Mirra 2 Task chair manufactured by Herman Miller.
SmugChair 1388 is at my home so it was not difficult to note the required observations and to
fill the required form. However, I found Mirra 2 Task in the office of my friend. I asked my
friend to take his chair to make the observation for the evaluation. He agreed and thus I
completed both the %EDS forms that I attached with this Report.
SmugChair 1388 lacks of “seat pan adjustability” and “backr...


Anonymous
Really helpful material, saved me a great deal of time.

Studypool
4.7
Trustpilot
4.5
Sitejabber
4.4

Related Tags