Software Development Process

1
Software Development Process

• Aditya P. Mathur
• Purdue University
• Analysis June 7-8, 1999
• Design June 9-11, 1999
• _at_ Raytheon Technical Services, Indianapolis.

Last update June 6, 1999 Design Part I
2
Topics to be covered

• Review Actors and use cases
• Development process
• Design
• Basic principles
• Collaboration diagrams
• Principles and guidelines (again)
• Class diagrams
• Deployment diagrams

3
Actors (1)

• Who is an actor?
• An entity external to the system.
• This entity participates in some way in at leas
  one domain process.
• This entity typically stimulates the system with
  input events or receives something from it.

4
Actors (2)

• Initiator Actor
• One who initiates a domain process.
• Participating actor
• One who participates in a domain process.
• Actors are usually
• Humans playing a role
• computer systems
• electrical or mechanical devicesanything remains
  ?

5
Actors (3)

• How to choose an actor?
• Identify a least one user who can enact an actor.
• Maintain a minimum overlap between the roles that
  instances of different actors play in relation to
  the system. Avoid two or more actors having the
  same or similar roles.

6
Use cases

• What is a use case?
• A domain process.
• We give it a name.
• We identify an actor that initiates this domain
  process and gets value out of this domain process.

7
Discussion

• Is the internet an actor ?
• Compare the internet with the communication
  system used by POST to send logging information
  to a central computer in the store.
• Is a weapon an actor ?
• Compare the weapon with the Point of Sale
  Terminal (the actual cash register).
• Compare a commander-weapon pair with a
  buyer-seller pair. Any differences? Similarities?

8
A development process (1)

• Phases
• Workflows
• Iterations

9
A development process (2)

• Phases
• Inception
• Elaboration
• Construction
• Transition

10
A development process (3)

• Workflows
• Requirements
• Analysis
• Design
• Implementation
• Test

11
A development process (4)

• Iterations
• Each phase might go through one or more
  iterations.
• Examples
• Requirements might go through two iterations
  during the inception phase.
• In the elaboration phase one might go through two
  iterations of R, A, D, I, and T.

12
Workflows-Phases
Phases
Workflows
Inception
Elaboration
Construction
Transition
R
A
D
I
T
Iter 1
Iter 2...
Iterations