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Universal and Accessible Design Principles. Scope of the Discussion “universal design” and "accessible design" are often used interchangeably Both terms.

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Presentation on theme: "Universal and Accessible Design Principles. Scope of the Discussion “universal design” and "accessible design" are often used interchangeably Both terms."— Presentation transcript:

1 Universal and Accessible Design Principles

2 Scope of the Discussion “universal design” and "accessible design" are often used interchangeably Both terms focus on designing products and services so that as many people, with as broad a spectrum of abilities as possible, can use them. Yet "accessible design" and "accessibility" have taken on legal meanings that force a distinction to be drawn between universal and accessible design. In essence, accessible design is mandated by law while universal design is not. This presentation focuses on universal design.

3 Example Universal design principles embody accessible design principles. However, accessible design may not be universal design. For Example: This restaurant has the mandated number of handicapped parking spaces and a handicapped entrance. However, the parking is in the back of the building by the garbage. The handicapped entrance is near the handicapped parking through the kitchen. These arrangements satisfy the legal requirements for accessible design, but do not exemplify universal design. Parking space Handicapped Entrance

4 Goals: Present the principles of universal design Provide a rational for each principle Provide examples for each principle Promote the principles so designers will be inclined to utilize them Goals

5 Entities designed from a universal design perspective are: Equitable Ergonomically Sound Perceptible Cognitively Sound Flexible Error-Managed (Proofed) Efficient Stable and Predictable Principles

6 Equitable: Universally designed entities should be equitable in that the entities should provide the same means of use for all users: identical whenever possible; equivalent when not. The products and processes should avoid segregating or stigmatizing any users, making the design appealing to all users. Equitable

7 Curb cuts eliminate discrimination and stigmatization. Equitable Everyone is better served: people in wheelchairs people riding bicycles people pushing baby strollers people who have trouble with stairs

8 Ramps eliminate discrimination and stigmatization. Equitable Everyone is better served: people in wheelchairs people who have trouble with stairs

9 Microcomputer technology stabilizes the image for : people who are tired people with arthritis people with neuro-muscular disabilities Equitable Image Stabilizing Binoculars provide the same means of use for all users.

10 Ergonomically Sound: The physical demands associated with the use of an entity must be within acceptable limits for a wide range of users. Ergonomically Sound

11 entrance ramps must not be so steep that wheelchair users cannot move themselves (or be pushed) up the ramp appropriate space for easy wheelchair navigation must be provided Ergonomically Sound Entrances and Corridors

12 Door knobs should be placed so that a door without an automatic opener can be opened by a person in a wheelchair. The force required to open a door should allow a wide range of people to physically open the door. Ergonomically Sound Doors

13 Ergonomically Sound Harmful and unnecessary lifting and carrying should be avoided.

14 Perceptible: Designed entities must effectively communicate necessary information to the user, regardless of ambient conditions or the user's sensory abilities. Perceptible Illustration taken from

15 Perceptible

16 This device uses 10 different audible sounds. They need to be perceptible to be functional.

17 Perceptible Emergency warning systems must be perceptible by as many people as possible. Sounds loud attention-getting pitch alternating intensity/pitch Lights bright vivid usually flashing

18 Cognitively Sound: The cognitive demands of designed entities must be within acceptable limits for a wide range of users. Cognitive demands include, but are not limited to: memory requirements, task complexity, language complexity, and reaction times. Designers need to build knowledge into the environment, product, or process. Cognitively Sound

19 Large buildings house many departments, so designers must provide cognitive supports to help people navigate. Signage Color-coding schemes and path markers International icons for toilets, restaurants,hospitals, etc.

20 Cognitively Sound International icons allow people of differing nationalities, people who cannot read, and people who are cognitively impaired to negotiate complex environments.

21 Cognitively Sound TASK STRUCTURE should be appropriate to the task – neither too simple (leading to boredom) nor complex (leading to error and frustration). Instructions for setting the clock of a phone answering system.

22 Assembly instructions for a chest of drawers. Cognitively Sound Clear Concise Uses pictures This is from a Danish company that distributes internationally.

23 MATERIALS must support different learning styles and human intelligences. Reading, performing mathematical operations, or memorizing long sequences of actions or codes places constraints on who can perform a job. Cognitively Sound

24 Analyzing the cognitive demands of jobs is more difficult than analyzing physical activity, especially because workers often develop complex strategies to hide their inabilities. Common problems Workers who cannot read Workers who are color blind Workers who cannot remember code or action sequences Cognitive issue(s) indicators increased errors decreased productivity other symptomatic indicators Cognitively Sound

25 Flexible: Designing flexibility into an entity increases the likelihood that the products, systems, and environments can be used and experienced by people of all abilities, to the greatest extent possible, without adaptations. Flexible

26 adjustable seats adjustable steering wheels adjustable floor pedal positioning adjustable mirror positions adjustable temperature adjustable lights for different areas of the vehicle adjustable distribution and intensity of music Flexible The automotive industry has led the way in terms of flexible design. Vehicles provide :

27 Flexible Flexibility needs to be built into the workplace and the interface between the worker and the job process. Braille Speakerphone Text Telephone TTY

28 Flexible Agile Devices and Systems Provide Flexibility Adjustable seating and positioning

29 Flexibility arises from many sources: times for starting and finishing a job tempo of the work the sequencing of different parts of the job conditions for participating in the work activity time and location where the work will occur technology for participating in various aspects of the job delivery channels for inventory materials / supplies Flexible

30 Error Managed (Error Proofed): Entities must be designed so that they support doing the right thing. It is important to create a design wherein errors can be managed. This applies to consumers, workers, and students. Error Managed (Error Proofed)

31 Error Proofing Strategies: 1.Do not allow the user to make an error. Examples: a) Microwave oven stops when the door is opened. b) Car will not start unless gear in park/neutral. 2.Provide a warning that an error has or will occur. Examples: a) A buzzer sounds if car key is left in ignition when car door is opened. b) Warning display for car high engine temperature. 3.Provide easy way to correct errors if they occur. Examples: a) Microsoft Windows use of the z key stroke. b) Undo option in word processor edit features.

32 Designers strive to eliminate errors when consumers use their products and when workers manufacture and assemble products in a production system. Error Managed (Error Proofed) EXAMPLE: Diesel fuel nozzle too large for unleaded gas tank opening. Note Color Coding

33 Error Managed (Error Proofed) Ignition Keys Steering Wheel Lights Gear Shift Door Locks Warning Lights Electrical Temperature Gas Door Open Seat Belts Today’s cars exhibit a host of error proofing features.

34 Error Managed (Error Proofed) When doors open: The microwave oven turns off The washer stops The dryer stops

35 In education, where people learn by making mistakes, elements of the process not critical to the learning objectives should be error-proofed. Errors in the process segment associated with the educational objectives should be managed so as to facilitate the educational process. Error Managed (Error Proofed)

36 Error-Proof Setup and Preparation Error-Proof End Activity Transition & Clean Up Manage Errors Error Managed (Error Proofed)

37 Error-proofing is a core strategy for achieving the objectives associated with lean production and quality control programs. For workers without disabilities, the error-proofing strategies fight boredom, fatigue, and other distractions. For individuals with disabilities, the error-proofing strategies provide an essential dialogue between the job and person, enabling the person to actually perform the job. Error Managed (Error Proofed)

38 Efficient (Muda Elimination) - Designed entities need to be efficient in that they have reduced as much of the non-value added activities as possible and/or reasonable. In kaizen terms one would say muda elimination (Imai, 1997). Muda means waste in Japanese; however, “the implications of the word include anything or any activity that does not add value.”(Imai, 1997) Efficient (Muda Elimination)

39 Most discussions of universal design do not include efficiency / muda elimination. Muda elimination is a powerful universal design concept that touches on issues not raised by more typical discussions of universal design. >non-value added activities such as waiting >slow, effortful operations >the need to consistently re-check actions >tedious procedures These non-value added activities not only frustrate and antagonize most users, but also render the products unusable for those with a low tolerance for frustration. Efficient (Muda Elimination)

40 Reducing non-value added activity complements and in some cases overlaps the other universal design principles. Efficient (Muda Elimination) For example, by reducing both errors and the physical demands of a job (lifting, transporting), non-value added job components are also reduced.

41 Viewed as the elimination of any thing or any activity that does not add value, muda elimination has potential utility for consumer product design. Efficient (Muda Elimination) Examples of non-value added activity: Waiting for a service provider: telephone customer service cue emergency room service cue Making errors or having to recheck actions due to wrong or unclear operating instructions in user manuals or assembly instructions. Excessive system configuration time. Having to re-enter all information in a computer form if only one item needs to be changed. A large collection of features and options that complicate product operations and are rarely or never used.

42 Efficient (Muda Elimination) Standardized work procedures & Work Place Organization work to reduce non-value activities. A French term meaning everything in its place – used by chefs and a core concept in their training. Reduce time spent searching for things, or figuring out what or how to do something.

43 Stable and Predictable: Designed entities need to be stable and predictable in that users can expect performance that supports the desired activity. While each entity presents unique requirements for stability and predictability, a common theme across all designed entities is the need to reduce the inherent variability of using the entity. Stable and Predictable

44 Buildings and facilities Temperature Light Noise Electrical Power Elevators, escalators, and all infrastructure systems should be reliable. The common cause variability of these elements should be very low, essentially zero.

45 workplace organization standardized work procedures utilizing visual controls Stable and Predictable Self-managing features that help reduce common cause variability and create more stable, predictable environments for everyone:


47 Grooks 4, P Hein, Doubleday & Company, Garden City, N.Y. 1972

48 Synergisms among the Universal Design Principles

49 Universal design principles work synergistically and are best employed as part of a coherent design strategy. Equitability Ergonomic soundness Perceptibility Cognitive soundness Error management Flexibility Efficiency Stability and predictability

50 Synergisms among the Universal Design Principles Read & Interpret Very error prone. The acceptable level is marked. Much less error prone. TASK: Read the dials and verify correct operation based on meter readings. Least cognitively Demanding. Rotate meter dial – vertical alignment means acceptable. Also use markers.

51 Conclusions

52 Equitability Ergonomic soundness Perceptibility Cognitive soundness Error management Flexibility Efficiency Stability and predictability Conclusions The greatest benefits of universal design derive from a conscious, systematic application of the principles in that there are synergistic interactions that come about with the implementation of several principles.

53 Universal design can be defined as the design of entities that can be used and experienced by people of all abilities, to the greatest extent possible, without adaptations. Universal design can be accessible design if it is driven by legal mandates, but universal design expands accessibility not simply because it is mandated, but rather because it is seen as a goal in its own right. The universal design principles seek to enhance human capabilities by supporting what people do best and avoiding what is most difficult and problematic. Conclusions

54 The European Concept for Accessibility Network Makes the case for equating universal design with good design. In discussing diversity in the years 2000 and beyond they urge Europeans to “no longer talk about the specific needs of certain categories of people, but talk about human functioning. We should look at every aspect of human functioning, without categorizing. … Accessibility will loose its stigma and become a mainstream issue. We won’t need terms like Design for All or Universal Design anymore. We will only refer to good design and bad design”

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