Biomedical Engineering Reference
In-Depth Information
Table 6.8: Criteria Assessment Table
Specification item
Solution 1
Solution 2
Solution N
..
PDS item #1
Numeric grade
Numeric grade
Numeric grade
PDS item #.
Numeric grade
Numeric grade
Numeric grade
PDS item #N
Total score
Σ↓
Σ↓
Σ↓
Σ↓
Table 6.9: Criteria Assessment for Measurement of Temperature
Specification
Item
Mercury
Thermometer
Infrared
Camera
Thermocouple
Temperature
Sensitive Gels
Integrated
Circuit Chip
1. Measure
temperature
from 0-40°C
2. Not toxic
3. Reusable
after suitable
sterilization
4. Low power
consumption
5. Low purchase
cost
6. Ability to
transmit data
Total Score
Clearly the grading is subjective. However, one way of removing subjectivity is to pass the
table to others in your design team and let them do the grading. You can then accumulate
the data into one table (by adding the scores together), producing a more coherent result.
After some analysis your table may look like Table 6.10 . Note the last thing to do is sum the
columns, with the highest score giving you your best solution.
The table illustrates two front-runners, but the totals are so close there is little to choose
between them. There is one column with zeroes; the rule is any zeroes usually mean
automatic elimination from the process. Normally this happens by default but you need to
keep your eyes open.
6.5.3 Weighted Criteria Assessment
If, as in Table 6.10 , the result is close or there is no clear winner, no champion, weighting
the criteria can be very useful. Equally you can simply use it all of the time. Here
 
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