Effectiveness of keywords is determined. For each node within the analysis, the variability and margin of the node is used to create a risk factor that is used to identify nodes for further analysis. The lifter comprises at least one grabbing jaw having a pair of arms carrying pads for contacting an outer surface of the rotor blade in predetermined grabbing areas. The center is communicated with via the communication device using the GPS information to report a traffic condition at a vicinity of a location.