5

Excellent in all aspects

Seat = Quality of the seat

1

Poor (uncomfortable).

2

Average.

3

Acceptable, with one or two problems.

4

Good, no real problem.

5

Very comfortable.

Service = Involvement of the equipment manufacturer in the implementation process

1

Sale only, no service.

2

Poor follow-up during the breaking-in period.

3

Minimally adequate follow-up during the breaking in period.

4

Satisfactory follow-up during the breaking in period.

5

Entirely satisfactory follow-up during the breaking in period.

On task = years of experience with the task associated with the equipment

Corresponding to the median for all users of the equipment.

On job = years of experience as a worker in this mine

Corresponding to the median for all users of the equipment.

Age = age of worker when the new equipment arrived

Corresponding to the mean for all users of the equipment.