1. Draw a first-cut design class diagram (DCD) based on the domain classes for the Create New Listinguse case.
2. Use the CRC card technique to verify the classes that are involved in the Create New Listinguse case. Recall that creating a new listing involves an agent, a real estate office, and a listing. Decide which class should have the primary responsibility for collaborating with the other classes and then complete the CRC cards for the use case. (Show me your cards).
3. Update the design class diagram with method named from the CRC cards. For this solution, do not try to determine entire method signatures, just the names.

Event	Type	Use case
Real estate office submits new listing	External	Add new listing
Agent request listing information	External	Provide listing information
Time to produce multiple listing book	Temporal	Produce multiple listing book
Real estate office submits listing change request	External	Record listing change
New real estate office opens (implied)	External	Add new real estate office
Change real estate office information	External	Update real estate office info
New agent is hired (implied)	External	Add new real estate agent
Change agent information	External	Update real estate agent info
House is sold (from CRUD)	External	Delete listing
Real estate office closes (from CRUD)	External	Delete real estate office
Agent retires/quits (from CRUD)	External	Delete real estate agent

Use case name:	Create a new listing
Scenario:	MLS clerk creates a new listing
Triggering event:	New property is put up for sale
Brief description:	The listing agent is identified and verified. The new property information is entered into the system, along with images etc.
Actors:	MLS clerk
Related use cases:	Real estate office/agent creates a new listing (Web version scenario)
Stakeholders:	Real estate office, Real estate agent, Property owner
Preconditions:	Real estate office must exist Real estate agent must exist
Postconditions:	New listing must be created and associated with RE office and RE agent
Flow of activities	Actor	System
	1. Find real estate agent 2. Enter new listing information	1.1 Display agent and office information 2. Create new property listing record, associated with agent. Display results.
Exception conditions:	1.1 Agent information not found. Display not found message.