To which of the following does an experimenter apply "random assignment"?

Weaning a client off reinforcers obtained in treatment is done in a hope the client:

a) Will obtain reinforcement from peers. b) Will become more self-sufficient. c) Will obtain reinforcement from the environment. d) May have made sufficient gains to function without reinforcement.

Units of information in long-term memory are organized in a complex system of linked meanings, according to which model of memory?

a. modular retrieval model b. network model c. congruence model d. serial position model