Use this activity to enter information about one or many controls associated with each cause.Controls are activities that may assist in the identification, prevention and/or detection of design or process failures, or their effects.
Detection is an assessment of the ability of the proposed control. Each control 
  has a detection ranking. Each cause has one or many defined control(s). These 
  control(s) will be evaluated as a group for each cause when assessing the detection 
  ranking used for risk priority number (RPN) calculation. Therefore, the most 
  efficient control takes precedence when calculating the RPN number. This means 
  that the lowest detection ranking will be used for the RPN calculation.
This activity requires the existence of at least one structure or routing alternate. This alternate must be associated with at least one FMEA function, failure, cause, and effect.
As a result of this activity, you will have entered information about one or more FMEA controls, and their detection ranking, that are related to the cause.