The three electronic security system (ESS) concepts the consultant needs to understand when creating an ESS system are threats, countermeasures, and:

Risks is the third core ESS concept alongside threats and countermeasures. In ESS methodology, risks represent the probability and impact of a threat exploiting a vulnerability, and all three concepts must be understood together to properly scope and design a security system.

Mitigation techniques are methods derived from countermeasures - they are a subset of the countermeasures concept already included in the triad, not a separate foundational concept.

Asset control is a security objective or outcome, not one of the three foundational ESS analytical concepts used to evaluate and design a system.

Integration refers to how ESS subsystems interconnect and is a design/implementation concern, not a foundational analytical concept of the ESS framework.

Intrusion detection is a specific ESS subsystem or technology category, not one of the three core conceptual pillars of ESS theory.