1. Jobs in services are often less structured than in manufacturing
2. Customer contact is generally much higher in services compared to manufacturing
3. In many services,worker skill levels are low compared to those of manufacturing employees
4. Services are adding many new works in low-skill,entry-level positions
5. Employee turnover is high in services,especially in low skill job
6. Input variability tends to be higher in many service environment than in manufacturing
7. Service performance can be adversely affected by many factors outside of the manager's control