Time (T), frequency (F) and difficulty (D) evaluation table
| CPN factor | Qualitative evaluation | Linguistic evaluation | Value |
|---|---|---|---|
| Time (T) | Very high | More than 20 min | 9–10 |
| High | Up to 20 min | 7–8 | |
| Medium | Up to 10 min | 5–6 | |
| Low | Up to 5 min | 2–4 | |
| Very low | Less than one minute | 1 | |
| Frequency (F) | Very high | Up to once per single shift | 9–10 |
| High | Up to once per day | 7–8 | |
| Medium | More than once per week, but less than once per day | 5–6 | |
| Low | Up to once per week | 2–4 | |
| Very low | Once per month | 1 | |
| Difficulty (D) | Very high | Unacceptable ergonomic conditions of execution (i.e. heavy parts, unsafe postures) and/or complicated operations that require the help of experienced technicians to be completed | 9–10 |
| High | Uncomfortable ergonomic working conditions and complicated operations that require, for example, special training to be carried out correctly | 7–8 | |
| Medium | Acceptable ergonomic conditions and not particularly complex operations that require a certain test period in order to be carried out correctly | 5–6 | |
| Low | Good ergonomic conditions, easy operations to be performed with the help of tools | 2–4 | |
| Very low | Optimal ergonomic conditions and very easy operations | 1 |
| CPN factor | Qualitative evaluation | Linguistic evaluation | Value |
|---|---|---|---|
| Time (T) | Very high | More than 20 min | 9–10 |
| High | Up to 20 min | 7–8 | |
| Medium | Up to 10 min | 5–6 | |
| Low | Up to 5 min | 2–4 | |
| Very low | Less than one minute | 1 | |
| Frequency (F) | Very high | Up to once per single shift | 9–10 |
| High | Up to once per day | 7–8 | |
| Medium | More than once per week, but less than once per day | 5–6 | |
| Low | Up to once per week | 2–4 | |
| Very low | Once per month | 1 | |
| Difficulty (D) | Very high | Unacceptable ergonomic conditions of execution (i.e. heavy parts, unsafe postures) and/or complicated operations that require the help of experienced technicians to be completed | 9–10 |
| High | Uncomfortable ergonomic working conditions and complicated operations that require, for example, special training to be carried out correctly | 7–8 | |
| Medium | Acceptable ergonomic conditions and not particularly complex operations that require a certain test period in order to be carried out correctly | 5–6 | |
| Low | Good ergonomic conditions, easy operations to be performed with the help of tools | 2–4 | |
| Very low | Optimal ergonomic conditions and very easy operations | 1 |
Source(s): Authors' work
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