Mountain View Community Hospital

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Mountain ViewCommunity Hospital

• Laurinda Mitchell
• Marc Benefield

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Who MVCH Depends On

• Employees
• Patients
• Physicians
• Volunteers

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Common Attributes

• These are attributes that these four people
  (entities) share
• Address
• City/State/Zip Code
• Date pf Birth
• Name
• Phone Number
• Person_ID

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Unique Attribute

• These are the attributes that are peculiar to
  each PERSON (entity)
• Employees-------Date Hired
• Volunteers-------Skill
• Physician--------Specialty Pager
• Patient------------Calc_Age
• Contact_Date

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Unique Methods

• Each PERSON (entity) has at least one unique
  method
• Employee Calculate_Benefits
• Volunteer Assign_to_Center
• Physician Assign_to_Location
• Patients Assign_to_Location

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The Patient

• Cardinality with PHYSICIANS
• Each PATEINT has only one PHYSICIAN
• There are two types of PATIENTs
• Resident
• Assigned to bed
• Date of admission
• Outpatient
• Scheduled for zero or more visits
• Visit
• Date (partial identifier)
• Comments

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The Employee

• There are three types of employees
• Nurse
• Attribute qualification (indicates RN, LPN)
• Staff
• Attribute - job class
• Technician
• Attribute Skills
• Relationship assigned to one or more
• laboratories

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Care Center

• Examples of care centers include
• Maternity
• Emergency
• Cardiology
• Attributes
• Name
• Location

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Care Center

• Cardinality with NURSEs
• One or more nurses assigned to Care Center
• One RN must be in charge
• Bed Attributes
• Bed_Id
• Bed_Number
• Room_Number
• Cardinality with PATIENT
• Each resident patient must be assigned a bed
• A bed may or may not have a patient assigned to
  it at any given time

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Buildings

• Buildings contain Care Centers
• Attributes include
• Building_Number
• Building_Name
• Building_Code

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Laboratory

• Laboratories are housed in only one building, but
  a building can have more than one lab.
• A laboratory includes employees and equipment and
  has a method call number_of_employees
• Attributes
• Name (ID)
• Location
• Cardinality with TECHNICIANs
• LABORATORY has one or more TECHNICIANS
• TECHNICIANS are assigned to one or more
  LABORATORIES

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Project Question 1

• Is the ability to model superclass/subclass
  relationship likely to be important in a hospital
  environment such as Mtn View Community Hospital?
  Why or why not?

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Project Question 1Answer

• The ability to model superclass/subclass
  relationships are important in this case study.
  Placing the common attributes and behaviors into
  classes displays a better understanding and it
  simplifies the system. This then leads to
  improved system redesign and the ability to add
  extensions to the system when needed.

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Project Question 2

• Do there appear to be any link objects in the
  description of the data requirements in this
  project segment? If so, what are they?

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Project Question 2answer

• There doesnt seem to be any linked objects in
  the system. However, there could be an
  association between the Nurse class and Care
  Center class if another class was added, one that
  would contain information on whether or not the
  nurse was a nurse in charge.

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Project Question 3

• Are there any abstract object classes in the
  description of this hospital? Why or why not?

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Project Question 3answer

• Both the Employee and Care Center classes serve
  as abstract classes. Abstract classes are used
  for generalizing the information needed by their
  subclasses.

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Project Question 4

• Are there any derived associations or derived
  relationships that will need to be included in
  the class diagram? If so, what are they?

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Project Question 4answer

• Yes. There could be a derived relationship
  (/associated with) between laboratory and care
  center. Also, between physician and care center
  (works in).

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Project Question 5

• Each resident patient has a method of assign
  ToBed (Bed), which overrides the assign
  ToLocations method of all patients. What is the
  reason for overriding?

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Project Question 5answer

• The override is necessary because the assign
  ToLocation method for all patients could be a bed
  that is not in a care center (such as day
  surgery).

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Project Exercise 1

• Draw a class diagram to accurately represent this
  set of requirements, carefully following the
  notation from this chapter.

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Project Exercise 2

• Develop definitions for each of the following
  types of objects in your class diagram from
  project exercise 1. Make reasonable assumptions
  based on your own knowledge and experience.

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Project Exercise 2answer

• Classes - a structure used to store information
  about an entity
• Attributes - information that identifies a class
  that is stored within the class structure
• Relationships - the connection between other
  classes to help define the hospital or other
  types of organizations
• Methods - actions and calculations that the
  classes perform

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Project Exercise 3

• You should recognize the statement A nurse
  cannot be appointed nurse_in_charge of the Care
  Center unless she or he has an RN certificate as
  a statement of a business rule. How did you
  model the business rule differently from what you
  did in the project case in chapter 4? What is
  the constrained object? Is it an entity, an
  attribute, a relationship or some other object.

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Project Exercise 3answer
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Project Exercise 3answer (cont.)

• The EER diagram from chapter 4 shows that a nurse
  can be a nurse_in_charge for optional one care
  center. The graph also shows that the
  constrained object is RN Certificate. RN
  Certificate serves as an attribute attached to
  Nurse.

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Project Exercise 4

• Compare the class diagram you developed in this
  chapter with the EER diagram that you developed
  in Chapter 4 and ER diagram you developed in
  Chapter 3 in Project Exercise 2. What are the
  differences between these two diagrams? Why are
  there differences.

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Project Exercise 4answer

• Differences exists between these diagrams because
  they are different types of diagrams that show
  the same information flow and information
  processing. The object oriented portrays
  entities as a class object. Class objects also
  include behavior of the entities as well as
  attributes. This is one thing that is different
  form entities.

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Project Exercise 4answer (cont)

• The object oriented diagrams are more compact
  compared to the other diagrams.
• Object oriented diagrams also show some entities
  as abstract databases, such as Care Center and
  Employee.

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Project Exercise 5

• Did you find any examples of aggregation or
  composition in the description of the project in
  the chapter? Why or why not?

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Project Exercise 5answer

• Both aggregation and composition are shown within
  the diagrams.
• An example of aggregation can be seen in the
  Employee abstract class. In it there are only 3
  types of employees listed (Nurse, Staff, and
  Technician). It doesnt account for the other
  employees in the hospital.

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Project Exercise 5answer (cont)

• This diagram also shows composition with the
  statement Patients are divided into 2 groups
  outpatient and residents. this statement is
  considered composition because there are no other
  types of patients besides outpatients and
  residents.

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Marcs Question 1

• What is a generalization path and how is it used
  in the MVCH Project Case?

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Marcs 1 Answer

• A generalization path is shown as a solid line
  from the subclass to the superclass, with a
  hollow triangle at the end and pointing toward
  the superclass.
• In MVCH Project they are used several times, one
  example is by connecting the subclass employee,
  physician, patient and volunteer to the
  superclass Person

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Marcs Question 2

• What does the overlapping and incomplete mean in
  the MVCH diagram?

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Marcs 2 Answer

• Overlapping is when a dependent may descend from
  more than one of the subclasses.
• Incomplete means some subclasses have been
  specified, but the list is known to be
  incomplete. There are additional subclasses that
  are not yet in the model.

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Laurinda 1 Question

• What is the database for Person broken down into
  and what calculation(s) are used for each
  division?

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Laurinda 1 Answer

• The databases for Person are Employee, which is
  an abstract class for Physician, Patient, and
  Volunteer. Yes, these databases do have
  calculation. Employee is Cal_Benefits(s)
  Physician is used Treats_Patients() Patients
  calculations are Cal_Age() and assign_to_Location
  (bed) Volunteers are assign_To_Center (Care
  Center)

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Laurinda 2 Question

• In MVCH class diagram are there any examples of
  composition and if so, what are they.

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Laurinda 2 Answer

• There is a composition in the diagram.
  Composition could be used for the class called
  Employee. This is because the class is divided
  up as Nurse, Staff, and Technician. There are no
  other types of employees included in the diagram.