Buzan distinguished five models of security due to newly emerging diversity of perceived threats:

1. Military security concerns itself with the two-level interplay of the armed offensive and defensive capabilities of states and state’s perceptions of each other’s intentions,

2. Political security focuses on the organizational stability of states, systems of government, and ideologies that give them legitimacy,

3. Economic security emphasizes on prioritizing access to resources, finance, and markets necessary to sustain acceptable levels of welfare and state power,

4. Societal security concerns itself with the ability of societies to reproduce their traditional patterns of language, culture, association, religious and national identities and customs within acceptable conditions for evolution,

5. Environmental security deals with the maintenance of local and planetary biosphere as well as space in order to ensure continued existence of all human beings.