The key practises of EVM include:

Establish a performance measurement baseline (PMB)

• Decompose work scope to a manageable level
  
• Assign unambiguous management responsibility
  
• Develop a time-phased budget for each work task
  
• Select EV measurement techniques for all tasks
  
• Maintain integrity of PMB throughout the project
  

Measure and Analyze performance against the baseline

• Record resource usage during project execution
  
• Objectively measure the physical work progress
  
• Credit Earned Value according to Earned Value techniques
  
• Analyse and forecast cost/schedule performance
  
• Report performance problems and/or take action