This cluster-RCT was conducted at the departments of four Dutch companies (a railway transportation
company, an airline company, a steel company, and a university including its university medical hospital). Directly
after the randomisation outcome, intervention departments formed a working group that followed the steps of PE
during a six-hour working group meeting. Guided by an ergonomist, working groups identified and prioritised risk
factors for LBP and NP, and composed and prioritised ergonomic measures. Within three months after the
meeting, working groups had to implement the prioritised ergonomic measures at their department. Data on
various process components (recruitment, reach, fidelity, satisfaction, and implementation components, i.e., dose
delivered and dose received) were collected and analysed on two levels: department (i.e., working group members
from intervention departments) and participant (i.e., workers from intervention departments).