The ICS principle that specifies Supervisors should only oversee three to seven subordinates with five being ideal
Span of Control
This diagram depicts the core aspects of Communications Interoperability

Interoperability Continuum
In the absence of a Logistics Section Chief or Service Branch Director, the COML reports to whom
Incident Commander (IC)
This person is primarily responsible for maintaing and repairing communications equipment
Communications Technician (COMT)
The type of radio system that dynamically makes use of all radio frequencies available to the system
Trunked
This ICS form serves as the initial incident briefing document
ICS 201 - Incident Briefing
This ICS principle excludes the use of "10-Codes" or jargon in multi-agency responses
Plain (Clear) Text
The three components of the Interoperability Continuum's "Technology Lane"
Data, Security & Continuity of Operations (Cybersecurity), and Voice
This Command Staff position manages on-scene media and public inquiries
Public Information Officer (PIO)
This person supervises Radio Operators, Tactical Dispatchers and Message Runners
Incident Communications Center Manager (INCM)
This mode of communication transmits on one frequency and receives on another
Duplex
This ICS form records details of individual or unit-level activities
ICS 214 - Activity Log
The ICS principle that specifies each person only has one boss or report
Unity of Command
This pocket-sized guide provides the national interoperability frequencies as well as other helpful information
National Interoperability Field Operations Guide (NIFOG)
The most capable, well equipped "Type" of ICS resource is a (Hint: I, II, III, or IV)
Type I
This person is responsible for the completion of the ICS 205
Communications Unit Leader (COML)
These two terms are sometimes used interchangeably with the term "channels"
Frequencies, Talkgroups
This ICS form serves as the Incident Radio Communications Plan
ICS 205 - Incident Radio Communications Plan
This ICS facility is staffed by the INCM, RADO(s), INTD(s) and Message Runner(s)
Incident Communications Center (ICC)
The document containing a region's interoperable frequencies, equipment and policy information
Tactical Interoperable Communications Plan (TICP)
The time specified for executing a given set of incident actions
Operational Period
This position refers to any staff member not holding an "Official" ICS Communications Unit title
Technical Specialists (THSP)
This device extends a radio system's coverage
Repeater
The ICS Form 219 is commonly referred to as a
T-Card
This ICS BRANCH contains the Communications Unit
Service
ECD's nationwide, web accessible database for agency communications resource information
CASM NextGen
This NIMS facility serves as the central point of contact for all news media personnel
Joint Information Center (JIC)
Frequencies on this radio net cannot be assigned by the COML
Air-to-Air Net
This communications mode transmits and receives on the same frequency
Simplex, Direct, or Talkaround
This form is used to log the details of radio traffic and messages
Form 309 Communications Log (This is not a FEMA recognized ICS Form)