1. Introduction  
1.1. Objective and Approach  
1.2. Structure of the Paper  
2. Foundations of Predictive Maintenance  
2.1. Conventional Maintenance Policies  
2.2. E-Maintenance  
3. Methodical Procedure  
3.1. Structured Literature Review  
3.2. Construction of the Framework  
4. Framework for Predictive Maintenance  
5. Discussion  
6. Conclusion  
6.1. Reflection of the Procedure