The membership of ERII consists of counterespionage, counterintelligence,   Technical Surveillance Countermeasures (TSCM) practitioners, business and corporate executives who have security responsibilities, as well as newcomers to the profession.  

The aim of ERII is to ensure the skill sets and the knowledge of TSCM, Counterintelligence and Counterespionage professionals evolves as changes in spying tactics, eavesdropping devices and detection methods occur. The organization’s success is a collaborative effort of members from around the globe with expertise in various areas within the umbrella of counterintelligence and TSCM.