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Some examples of Bad design. Example 1 For the bell to ring, the ti mer must be turned to greater than 15 minutes, and then set to the appropriate time.

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Presentation on theme: "Some examples of Bad design. Example 1 For the bell to ring, the ti mer must be turned to greater than 15 minutes, and then set to the appropriate time."— Presentation transcript:

1 Some examples of Bad design

2 Example 1 For the bell to ring, the ti mer must be turned to greater than 15 minutes, and then set to the appropriate time Not very Intuitive!!!

3 Both sides of the refrigerator are identical There is no handle on the front How do you open the fridge

4 Imperceptible!!! What is this sign telling motorists to do?

5 Check out

6 Difficulties using Every Day Products

7 Estimated Numbers with Functional Difficulty in the UK Dexterity – 1.7 Million Reaching and Stretching – 1.2 Million Manipulating and Gripping- 0.3 Million Lifting and Transporting – 0.6 Million

8 Difficulties with Everyday Products

9 Difficulties with Kettles Manipulation and gripping 273,000 Lifting and transporting 615,000

10 Manipulation

11 The order of difficulty of packaging products (1 being the easiest) is shown in the table below: 1 Cleaning solution 2 Washing up liquid 3 Soup tin 4 Sugar 5 Washing powder/liquid 6 Tin of tuna 7 Butter 8 Milk 9 Microwave meal packaging 10 Bread packaging 11 Tea bag 12 Instant soup packaging 13 Meat tin 14 Plastic bottle 15 Toothpaste 16 Cereal packaging 17 Cheese packaging 18 Jam jar 19 Shoe polish tin

12 Gripping 1 Cleaning solution 2 Microwave meal packaging 3 Instant soup packaging 4 Soup tin 5 Washing powder/liquid 6 Sugar 7 Milk 8 Washing up liquid 9 Bread packaging 10 Butter 11 Tea bag 12 Tin of tuna 13 Plastic bottle 14 Cheese packaging 15 Meat tin 16 Toothpaste 17 Shoe polish 18 Cereal packaging 19 Jam jar

13 Lifting 1 Shoe polish 2 Tin of tuna 3 Tea bag 4 Instant soup packaging 5 Meat tin 6 Cleaning solution 7 Butter 8 Bread packaging 9 Cheese packaging 10 Plastic bottle 11 Milk 12 Jam jar 13 Toothpaste 14 Cereal packaging 15 Soup tin 16 Washing powder/liquid 17 Sugar 18 Microwave meal packaging 19 Washing

14 Transporting Packaging products - transporting Products excluded from the list because of small sample numbers include; No excluded products 34 1 Cleaning solution 2 Tea bag 3 Instant soup packaging 4 Toothpaste 5 Milk 6 Bread packaging 7 Cereal packaging 8 Plastic bottle 9 Tin of tuna 10 Jam jar 11 Butter 12 Washing powder/liquid 13 Microwave meal packaging 14 Sugar 15 Washing up liquid

15 Capacity Demands (Capability Demands Clarkson)

16 Looking at the above milk bottle designs: Each bottle design demands that the user has a capacity to perform a vertical lift by gripping the handle with a closed fist grasp. We see that the bottles on the left will allow a greater range of hand sizes get a proper grip on the handle for lifting since it gives greater clearance dimension between handle and jug

17 In other words the structure of each bottle implies the user must have particular hand dimensions in order to manipulate the bottle Thus each bottle places different demands on the user attributes. If these demands are not met then the bottle cannot be used. This conflict is the essence of how capacity demands define the guards of our petri nets

18 The above is an example of an object capacity demand. There are other kinds of capacity demands based around action These must be measured against the personal capacities of the agent and the attributes of the environment This is summarised in the following

19 Capacity Demands Action and Objects Agent Capacities, Environmental Factors, State Attributes

20 More formally

21 Person Capability Tokens Environment Attribute Tokens Action Capability Demands Object Capability Demands Environmental Demands Incoming Tokens representing Person and State Transition Guard representing Barriers ( in terms of Capability Demands) State

22 Capacity Demands And Assistive Technology Action and objects place capacity demands on people and environment. For example using a standard kettle involves a capacity demand of being able to perform a vertical lift of up to 1 kg(which is the weight of the kettle when full with water), one handed using a closed fist grip. Assistive Technology changes the relation between personal and environmental capacities and the capacity demands of the action being executed. This relationship is represented by the guard of the CPN This is shown in the following example


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