A wearable device to be worn by an operator of an aircraft, comprising: a communication unit configured to receive aircraft parameters and an aircraft mode from an aircraft system; a database configured to store a rule set that defines a first aircraft mode with at least a first rule with a first alert condition and a first response associated with the first alert condition, wherein the first aircraft mode refers to a first flight mode providing a time context in which the first rule is applicable, and a second aircraft mode with at least a second rule with a second alert condition and a second response associated with the second alert condition, wherein the rule set further defines different operator identities, wherein the second aircraft mode refers to a second flight mode providing a time context in which the second rule is applicable; a processing unit coupled to the communication unit and the database, the processing unit configured to identify an aircraft mode from the aircraft mode received by the communication unit from the aircraft system and to evaluate, in the first aircraft mode, the first alert condition in view of the aircraft parameters and to initiate the first response when the aircraft parameters violate the first condition and, in the second aircraft mode, the second alert condition in view of the aircraft parameters and to initiate the second response when the aircraft parameters violate the second condition; and an alert unit coupled to the processing unit and configured to communicate the first response or the second response to the operator, wherein the processing unit is further configured to initiate the alert based on an identity of the operator defined in the rule set. a communication unit configured to receive aircraft parameters and an aircraft mode from an aircraft system; a database configured to store a rule set that defines a first aircraft mode with at least a first rule with a first alert condition and a first response associated with the first alert condition, wherein the first aircraft mode refers to a first flight mode providing a time context in which the first rule is applicable, and a second aircraft mode with at least a second rule with a second alert condition and a second response associated with the second alert condition, wherein the rule set further defines different operator identities, wherein the second aircraft mode refers to a second flight mode providing a time context in which the second rule is applicable; a processing unit coupled to the communication unit and the database, the processing unit configured to identify an aircraft mode from the aircraft mode received by the communication unit from the aircraft system and to evaluate, in the first aircraft mode, the first alert condition in view of the aircraft parameters and to initiate the first response when the aircraft parameters violate the first condition and, in the second aircraft mode, the second alert condition in view of the aircraft parameters and to initiate the second response when the aircraft parameters violate the second condition; and an alert unit coupled to the processing unit and configured to communicate the first response or the second response to the operator, wherein the processing unit is further configured to initiate the alert based on an identity of the operator defined in the rule set. <EOS>