How are 3 levels of requirements linked?

What is requirements modelling?
Represents requirements with multi-media
What is context diagram?
Discovering system boundaries and actors like a DFD diagram
Goals
Describes a desirable state
(ticket purchased/car repaired)

Soft goals
Describes some properties or constraints on that state (Ticket purchased quickly, car repaired cheaply)

Tasks
Active verbs describing how something is done or accomplishing a goal (Purchase ticket online)

Resouce
Describing resource that can be physical (5 seconds, ticket, ID)
