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Concept Selection

Concept generation phase develops a number of concepts.

Hence, the next step is to select the final concept to be further developed.

Problems

The criteria for selection may contradict to each other such as precision device may demand a higher cost in manufacturing process.

Each concept may have good and bad features within a single design, however a perfect final design is having good features.

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Concept Selection: Matrix Selection

Component of Matrix Selection

Criteria & Weightage
Datum
Concept

The selection process will compare each criteria for each concept with datum.

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Matrix Selection: Criteria and Weightage

Importance of criteria and weightage

Case 1

Performance : 1

Manufacturing: 0

Aesthetic: 0

The final product may perform very well, but may require very precision manufacturing process and looks ugly

Case 2

Performance : 0

Manufacturing: 1

Aesthetic: 0

The final product can be fabricated, but may not work and look ugly

Case 3

Performance : 0

Manufacturing: 0

Aesthetic: 1

The final product may look nice, but may not work and very expensive to fabricate.perform very well, but may be unable to be manufacture and ugly

Solution:

Performance : 0.6 or 60%

Manufacturing/production : 0.3 or 30%

Aesthetic : 0.1 or 10%

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Matrix Selection: Criteria

Bad Criteria

Improved Criteria

Good Criteria

Easy to compare (No of steps taken)
Well understood by group
Specific item is compared.

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Datum

One of the concept or similar product in market

For each criterion, the concept will be compared with the same of criterion of the datum.

Range of mark depends on type of selection matrix

Screening (‘-’ , 0 , ‘+’) : worse, equal, better
Scoring (-2, -1, 0, 1 ,2 ): worst, worse, equal, better , best

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Screening and Scoring Matrix

Screening Matrix: when the number of concepts is larger than 6.

Scoring Matrix: when the number of concepts is equal or less than 6.

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Meaning of total mark

Positive: the concept is better than the datum

Negative: the concept is worse than the datum

Highest mark amongst the concepts: the best concepts

Two concepts have equal mark: both concepts may have similar features which can be combined to develop a new concept

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Reflection of final design

Based on the total mark: the concept with the highest mark will be selected as the final concept.

However, there is a number of criteria on the final concept that is marked as -2,-1,0,1.

To ensure better final design, the criteria that has been marked as -2, -1, 0, 1 should be reflected whether the mark can be improved to 2 if possible.

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Final Design

The final design can be

One of the proposed concepts with the modification during reflection of the final design

The integration of two or more proposed concepts.

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Submission After Sem Break

Oral Presentation

Cover: Customer Need to Final Concept.
Every group must submit their video presentation via Youtube Channel
Duration: 20 min + 5 min (give brief of your final concept after reflection)

Minor Project

Submission Date: 7 May 2022, Saturday 11:59 pm