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• Record information 
• Assess information 
• Act 
The function “Record information” may be implemented several times for one functionality in this in 
stance. Thus it is the case in automatic track following, for example, that the input set/actual difference 
for a track is compared with an “off-track limit” in order to derive from the comparison the permissibility 
of the manoeuvre to be executed automatically. In this case, two functions of the “Record information" 
type would have to be implemented for the purpose of recording the set/actual deviation and limit. 
Moreover, a function of the “Assess information” type must be provided in order to test the permissibility 
of the manoeuvre being carried out.