Attributes a design should have Measures of effectiveness Quantifiable

Attributes a design should have measures of

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Attributes a design should have Measures of effectiveness Quantifiable (subjectively or measurably) Often “points” or a scoring system is used Qualitative objectives can be assigned a score Performance Safety Durability Aesthetic Usability Cost (MIE315 wait for economic analysis) Environmental Impacts (MIE315 wait for LCA) What the design should be?
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L02 Slide 56 Measuring Objectives: Points System Objective: short travel time (for public transit) Metric: Time to travel 25 km (minutes) Alternative Points 0 to 10 Bullet train 10 10 to 20 9 20 to 30 Commuter train 8 30 to 40 Subway 7 40 to 50 LRT 6 50 to 60 Streetcar 5 60 to 70 Bus 4 >100 0
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L02 Slide 57 Measuring Objectives: Scoring Qualitative Objectives Objective: should smell good Human perception of odour Points Strong pleasant smell 4 Mild pleasant smell 3 Neutral / no smell 2 Mild unpleasant smell 1 Strong unpleasant smell 0
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L02 Slide 58 Objectives
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L02 Slide 59 Constraints Attributes a design must meet to be acceptable If a constraint is unsatisfied, the design is not considered a possibility A criteria is set (which may or may not be quantitative), and a design option either meets or fails to meet the criteria Binary (i.e. go no go) This is one linkage with determining the functional unit, i.e. what would the functional unit need to be to meet all criteria What the design must be?
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L02 Slide 60 Constraints
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L02 Slide 61 Observations Design options must both perform the function, and satisfy constraints, but the function is the driving purpose of the design process o An airplane must both fly and satisfy FAA regulations, but the driving purpose of the design process is to build a vehicle that flies, not build a device that meets FAA regulations A single attribute can have both an objective and a constraint o A car should be as fuel efficient as possible (objective), but it cannot consume more than 10 L/100km (constraint) o An electric car should have as long range as possible (objective), but at least 200 km (constraint) o A ladder should be as light as possible (objective), but weigh no more than 25 lbs (constraint)
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L02 Slide 62 Fitness Trackers Consumer Reports, What are the functions, constraints, and objectives?
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L02 Slide 63 Example: Fitness Trackers Function: Constraints: Objectives:
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L02 Slide 64 Example: Mobile Phones Apple iPhone X HP Elite x3 Samsung Galaxy S8 BlackBerry KEYone Google Nexus 6P
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L02 Slide 65 Example: Mobile Phones Design objectives: Large display Good at multitasking High quality camera Long battery life Light weight Low cost
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L02 Slide 66 Example: Mobile Phones >> Design Objectives Large display (screen size in inches) Good at multitasking (how many GB of RAM) High quality camera (how many megapixels) Long battery life (storage capacity in mAh) Light weight (weight in grams) Low cost (Canadian $ for an unlocked phone) Apple iPhone X HP Elite x3 Samsung Galaxy S8 Blackberry KEYone Google Nexus 6P Screen size 5.8" 5.96" 5.8" 4.5" 5.7" RAM 3 GB 4 GB 4 GB 4 GB 3 GB Camera
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  • Fall '09
  • MURRAYTHOMSON

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