Employee: He is the worker of the firm. An employee works for the sales work place and must handle that work place. Sales Office: It is a realty work place which is sold out.Property: House, Condos, home buildings available.Owner: Independent World Health Organization owns one or many properties.Employee Attributes: Employee ID: It identifies the employee. It must be different.Employee Name: Name of the employee.Sales office attributes:Office number: It is symbol for work place. Office Location: Workplace physical location. This knowledge is also created for sate or town.Property Attributes:Property ID: It is different symbol for the property.Property Location:It is combination of attributes like address, city, state, ZIP code.