code: public ManagementStage getStage(final int index) {
  
  		if (index >= 0 && index < this.stages.size()) {
  			return this.stages.get(index);
  		}
  
  		return null;
  	}
docs: Returns the management stage with the given index.
  
  @param index
  the index of the management stage to be returned
  @return the management stage with the given index or <code>null</code> if no such management stage exists