skills related to operating tools used in a process
use case we shortly discussed with @fosterlynn on gitter https://gitter.im/valueflows?at=5836f6ba381827c24d76f394
- planned process which requires 1 tractor, 5 chainsows, 30 axex and 100 people to help
- 2 people need to have 'use tractro' skill, 10 'use chainsow' and 50 'use axe'