Vitek VTC-3516 Specifikace stáhnout pdf (Strana 25)

Design and Applied Technology (Secondary 4-6)

1.3.4 Methodology

1. Establish evaluation criteria

2. Prepare the evaluation matrix

3. Rate the concepts/products

4. Rank the concepts/products

The first step of the analysis is to make a table showing all important attributes of the

proposals and their weights. The weights are set up when the desirable product attributes are

first defined. As a basis, one may use the table for the product concept.

In case the evaluation criteria have drastic changes, re-constructing the table may be required.

For calculation’s simplicity, product properties that are identical in all alternatives can be

excluded from the evaluation.

It is a minimum requirement that each table should contain the following two columns for

each to-be-evaluated proposal, namely

(a) ‘Utility’, which may range from 0 to 5 for example, for the proposal’s merits for each

attribute; and

(b) ‘Weighted Score’, which is product of ‘Weight’ and ‘Utility’.

Finally, all products calculated have to be summed up on the bottom line. The best alternative

is the one of the highest sum.

Product Attributes

Weighting

Alternative 1 Alternative 2

Utility U

W x U Utility U W x U

Capacity 40 2 80 5 200

Ease of use 40 3 120 4 160

Design, appearance 10 5 50 2 20

Materials, recycling 10 3 30 2 20

Total 100 -- 280 -- 400

Specifications are established at the beginning of the design process. They do not necessarily

cover every consideration and may be changed for various reasons. There may also be

additional criteria, which are important to the design, such as

(a) Aesthetics,

(b) Ergonomics,

(d) Materials, and

(e) Usability.

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Vitek VTC-3516 Specifikace Strana 25