t02_bansalk_cheemakd_arorag8.pdf

Tutorial 6.0 Agenda: 1. Prescriptive Model of Design Process 2. Concept Selection 3. Fill out Page (Refined Problem Statement + Sketches + Decision Matrix) Prescriptive Model of Design Process Concept Selection Last week you developed a couple initial ideas to solve your client’s problem. This week, in addition to drawing at least one more idea, you will identify which of those is the most promising. What is a promising idea? An idea that:

● Addresses the client’s challenge in a thoughtful and empatheti c way ● Maximizes the objectives and does not go against the constraints you set out in Tutorial 4.0 ● Is possible to be built BY YOUR TEAM , BY THE END OF TERM We introduced 3 decision matrix techniques, as summarized below. NOTE: there are differences between how the textbook approaches these, and how we do. Please follow our instructions! Apply ONE of the following to your project: Numerical Evaluation Matrices The highest scored design is the Polyethylene bottle, with twist-off cap. This matrix shows constraints and objectives on the rightmost column. Each design alternative that does not meet one of the constraints is immediately removed as an option as signified by the “x”. All remaining design alternatives are evaluated (or estimated as best as possible) on each objective using metrics decided upon earlier. Every metric has been given a point system scale. The scores from each objective are added up and compared to give us the winner.

Priority Checkmark Method The highest scored design is Polyethylene bottle, with twist-off cap. This matrix shows constraints and objectives on the rightmost column. Each design alternative that does not meet one of the constraints is immediately removed as an option as signified by the “x”. Each objective is given a priority ranking from 1 - 3 check-marks signifying how important that objective is (Note: as you require 4 objectives for your charts, you will be giving 1-4 check marks) . For each of these objectives the design alternatives are assigned either a 1 or 0 based on whether they meet some arbitrary high value of the metric. (e.g. 70 points on a 0 - 100 point scale) If the design alternative meets the value it is deemed satisfactory and is awarded a score of 1. If it does not meet the value it is deemed unsatisfactory and is awarded a score of 0. The score (1 or 0) is then multiplied by the number of checkmarks allocated to that design. These check-marks are added up to give the final score for each design alternative.

The Best-of-Class Chart Design Constraints (C) and Objectives (O) Glass Bottle, with Twist-Off Cap Aluminum Can, with Pull-Tab Polyethylene Bottle, with Twist-Off Cap Mylar Bag, with Straw C: No sharp edges * * C: Chemically inert O: Environmentally benign 1 2 O: Easy to distribute 2 1 O: Long shelf life 2 1 Total: 5 4 The highest scored design is Polyethylene bottle, with twist-off cap. This matrix shows constraints and objectives on the rightmost column. Each design alternative that does not meet one of the constraints is immediately removed as an option as signified by the “x”. The remaining design alternatives are ranked in order of how well they meet that objective. The rankings are added up and the design with the highest ranking is the winner. In this case, the Polyethylene bottle scored 5 points and is the highest design alternative. What if my results are not what I expected/desired? Concept selection techniques are thinking tools, not hard rules. If you get an unexpected result it could be for one of the following reasons: ● It can be difficult to predict how an unfinished device will meet constraints. ● Objectives should be thoughtful and meaningful to the client. Additionally, the objectives that appear in the decision matrix should be those of the highest priority. ● Do you have too many criteria? This can lead to indeterminate results. It may be necessary to go back and tailor your objective tree, or adjust your understanding of the problem as a team. Group Activity ● Review your work from Tutorial 4.0 such that the problem definition, objective tree and metrics are fresh in your mind ● Generate a valid 3rd design alternative, with clear annotations describing how it works ● Apply one of the decision matrix techniques to isolate the top two that will progress to low fidelity prototyping (very basic proof-of-concept) ● Submit this workbook before 11:59PM tonight

Fill Out Page Full names and MacIDs of Members: Full Name: MacID: Karn Bansal bansalk Gauri Arora arorag8 Dhruv Cheema cheemakd Insert Refined Problem Statement: The problem presented to ABC Design Solutions involves Elissa, a fourth-year The problem presented to ABC Design Solutions involves Elissa, a fourth year student at McMaster University. During the winter, Elissa is eager to shovel her driveway in th winter but because she suffers from primary generalized dystonia, she has difficulty in lifting and moving the snow. Ellisa is unable to lift heavy loads such as a shovel loaded with snow because of her condition. She experiences involuntary muscle contractions and this problem is amplified when she is lifting a heavy load. Her arms and hands shake and her muscles strain under pressure. Elissa has said that when she is pushing down instead of lifting, that these symptoms tend to disappear. Thus, the solution lies within a device utilizing a pushing-down movement to help lift heavy loads. However, the device itself must not be heavy that it requires significant effort to carry. The design must be lightweight and able to be assembled or properly implemented in less than 2 minutes to reduce the overall strain for Elissa. Optimally, the device could be used by other individuals with a similar condition who prefer pushing-down rather than lifting to reduce pain and strain on the muscles.student at McMaster University. During the winter, Elissa is eager to shovel her driveway in the winter but because she suffers from primary generalized dystonia, she has difficulty in lifting and moving the snow. Elissa is unable to lift heavy loads such as a shovel loaded with snow because of her condition. She experiences involuntary muscle contractions and this problem is amplified when she is lifting a heavy load. Her arms and hands shake and her muscles strain under pressure. Elissa has said that when she is pushing down instead of lifting, that these symptoms tend to disappear. Thus, the solution lies within a device utilizing a pushing-down movement to help lift heavy loads. However, the device itself must not be heavy that it requires significant effort to carry. The design must be lightweight and able to be assembled or properly implemented in less than 2 minutes to reduce the overall strain for Elissa. Optimally, the device could be used by other individuals with a similar condition who prefer pushing-down rather than lifting to reduce pain and strain on the muscles. Insert pictures and explanations of your two (2) design alternatives (sketches) from last week’s Tutorial 5:

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