TaskFixed factorVariable factor
1. Job assignment, pick up tools, gas up equipmentX
2. Travel time to job siteX
3. Work site organization, tools, traffic signsX
4. Actual work operation climbing tree, cutting branches for a particular size tree and pruning classX
5. Presence or absence of electric wires, traffic, buildingsX
6. Clean up of work site, chipping brush, cutting up wood for a particular pruning class or activityX
7. Disposal of debris at dump siteX
8. Travel time back to crew headquartersX