3.4. The intervention
A before-and-after design was used to evaluate the effectiveness
of the hydraulic drop-down ladder rack in reducing worker effort.
The design was chosen because it is the most useful in demonstrating
the immediate impacts of short-term programs (Robson
et al., 2001).
Thirteen workers brought their vans to have the hydraulic
ladder racks installed at the distributor. While it was installed,
a member of the research team (PV) trained the participant on the
proper use of the ladder racks, including procedures to troubleshooting
and ladder rack maintenance. Surveys were done with the
workers at this time. The questions that were asked included: have
you ever seen a hydraulic ladder lift like this before? Do you think
the ladder lift will reduce the amount of effort you use to take down
and put up your ladder? Is there any other equipment that you
think the company should be purchasing to reduce your workload?
If you like it, would you tell other workers about it?
After introducing the interventions, participants were encouraged
to use the hydraulic ladder rack whenever it was appropriate.
Each participant was allowed to use the hydraulic ladder rack
continuously for 3 months, although the duration and frequency of
use in the field were not evaluated.
3.4. The interventionA before-and-after design was used to evaluate the effectivenessof the hydraulic drop-down ladder rack in reducing worker effort.The design was chosen because it is the most useful in demonstratingthe immediate impacts of short-term programs (Robsonet al., 2001).Thirteen workers brought their vans to have the hydraulicladder racks installed at the distributor. While it was installed,a member of the research team (PV) trained the participant on theproper use of the ladder racks, including procedures to troubleshootingand ladder rack maintenance. Surveys were done with theworkers at this time. The questions that were asked included: haveyou ever seen a hydraulic ladder lift like this before? Do you thinkthe ladder lift will reduce the amount of effort you use to take downand put up your ladder? Is there any other equipment that youthink the company should be purchasing to reduce your workload?If you like it, would you tell other workers about it?After introducing the interventions, participants were encouragedto use the hydraulic ladder rack whenever it was appropriate.Each participant was allowed to use the hydraulic ladder rackcontinuously for 3 months, although the duration and frequency ofuse in the field were not evaluated.
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