Concept Selection Facts About Concept Selection

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Concept Development Funnel concept generation concept screening concept scoring concept testing ME EN 4000 – Engineering Design I – Concept Selection 5 Selection Methods (contd.) • Multivoting. Each member of the team votes for a set number of projects. – Maybe: Depends on how objectively the team members vote.. • Pros and cons. The team lists strengths and weaknesses of each concept and makes a choice based upon group opinion. – Yes: The decision is group based and (presumably) objective. • Prototype and test. The organization builds and tests prototypes of each concept, making a selection based upon test data. – No: Too costly for hundreds of concepts. – Yes: Final concept selection. Source: Ulrich K, Eppinger S, Product Design and Development ME EN 4000 – Engineering Design I – Concept Selection 7 Selection Methods • External decision. Concepts are turned over to the customer or other external entity. – No: Customer should not be bothered with hundreds of concepts. – Maybe: Final concept selection. • Product champion. An influential member of the product development team chooses a concept based on personal preference. – No: Group consensus is preferable both for confidence and harmony. • Intuition. The concept is chosen by its feel. No explicit criteria are used. The concept simply seems better. – No: Design decisions need to be objective and justifiable. Source: Ulrich K, Eppinger S, Product Design and Development ME EN 4000 – Engineering Design I – Concept Selection 6 Selection Methods (contd.) • Decision matrices. The team rates each concept against pre-specified selection criteria, which may be weighted. – Yes: Preferred method. Source: Ulrich K, Eppinger S, Product Design and Development ME EN 4000 – Engineering Design I – Concept Selection 8
Two Stage Process 1. Concept Screening – Quick, approximate evaluation aimed at producing a small number of viable solutions. 2. Concept Scoring – Much more careful analysis of a relative small number of concepts in order to choose the single best option. Source: Ulrich K, Eppinger S, Product Design and Development ME EN 4000 – Engineering Design I – Concept Selection 9 Concept Screening: Steps 4-6 • Step 4 – Combine and Improve Concepts. – Is there a generally good concept which is degraded by a single bad feature? – Are there two concepts which can be combined to preserve the “better than” qualities while canceling the “worse than” features? • Step 5 – Select One or More Concepts. – After the team has gained sufficient understanding of each concept and its relative quality, a small number of concepts are chosen for further analysis and refinement (and perhaps testing). • Step 6 – Reflect on the Results and Process. – All team members should be comfortable with the outcome. Differences between team members may indicate missing criteria or rating errors. Source: Ulrich K, Eppinger S, Product Design and Development ME EN 4000 – Engineering Design I – Concept Selection 11 Concept Screening: Steps 1-3 • Step 1 – Prepare the Selection Matrix. – Enter concepts and criteria into the matrix. – Select reference concept (industry standard, main competitor, current product). Its performance is rated using 0’s. • Step 2 – Rate the Concepts. – Concepts that perform better than the reference are rated with +’s. – Concepts that perform similarly compared to the reference are rated with 0’s. – Concepts that perform worse than the reference are rated with –’s. • Step 3 – Rank the Concepts. – Sum up “better than”, “same as”, and “worse than” and enter the sum for each category in the lower rows of the matrix. – The net score is calculated by subtracting the number of “worse than” from the number of “better than”. Source: Ulrich K, Eppinger S, Product Design and Development ME EN 4000 – Engineering Design I – Concept Selection 10 Outpatient Syringe Concept A – Master Cylinder Each concept should include a sketch and short description All concepts should include a similar level of detail Displaced fluid from master cylinder actuates pusher. Upon release, sealed fluid cavity is filled with more fluid if necessary. Dose is set by length of stroke. Source: Ulrich K, Eppinger S, Product Design and Development ME EN 4000 – Engineering Design I – Concept Selection 12
Page 1: Identify Customer Needs Concept Sel
Page 5 and 6: Outpatient Syringe Concept G - Dial
Page 7: Concept Scoring Example: Outpatient

Concept Selection Facts About Concept Selection

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