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The following picture shows the possible alternative approaches applicable to UMA protocol:
- Self-Registration -> A
- Affiliate Registration through standard Identity technologies (SAML, OpenID, etc.) -> B
- Trusted Framework
Framework -> C 
Bootstrapping Trust is the fundamental phase where the subject builds his (trust) mental state towards other agent (Host, AM), evaluating the trustworthiness factors.
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Delegation can be represented as a vector in a Cartesian plan (X-axes: Level of trustworthiness between the delegator and delegated agent, Y-axes: level of delegation, based on the iterative process of the protocol), which has initial point (delegator), a terminal point (delegated agent), a length and a direction. 
The following picture shows the Cartesian plan representing a person-self sharing constellation: 