Scope and definition Chapter 2 Chapter 2 offers a definition of cyber and electromagnetic activities (CEMA) as well as scoping its application. It explains that CEMA provides a synchronisation and coordination function for these activities. Section 1 – The Defence approach . . . . . . . . . . . 13 2 Section 2 – Functional scope . . . . . . . . . . . . . . . 15 Section 3 – Command considerations . . . . . . . . . 17 JDN 1/18 11