1. Chap 28 UML Activity Diagrams and Modeling

2. Activity Diagram 1
Once an action is finished, there is an automatic outgoing transition
The diagram can show both control flow and data flow
a sequence of activities, including parallel activities.
for visualizing business workflows and processes, and use cases.
Business Process Modeling
The partitions are useful to see the multiple parties and parallel actions involved in the business process
Data Flow Modeling
the UML data store node is applicable

3. Activity Diagram 2 Receive Video Order Fill Order Send Invoice Deliver
Receive Payment
Close Order
Fulfillment
Customer
Service
Finance
Invoice
start
Action .
It does something
There is an automatic
transition on its completion A
transition
supports
modeling of
control flow
Fork
One incoming ,
and multiple
outgoing parallel transitions
and /
or object flows
Partitions
Show different
parties involved in the process
Join
Multiple incoming transitions and or
object flows ;
one outgoing transition
The outgoing continuation does not happen
until
all
the inputs arrive from
flows
Object Node
An object
produced or used by actions
This allows us to model
data
end of activity

4. Activity Diagram 3 Student Registration System Application Complete
Check Course
Availability
«datastore»
Courses
Applications
Check Applicant
Qualification
Students
Accept /
Deny
Reply

5. Expanded activity to Another Diagram

6. Model Events as Action

7. Guidelines
This technique proves most valuable for very complex processes, usually involving many parties.
If modeling a business process, take advantage of the "rake" notation and sub-activity diagrams.
"level 0" diagram keep all the actions at a very high level of abstraction. Expand the details in sub-diagrams at the level 1, and perhaps even more at the level 2.
to make the level of abstraction of action nodes roughly equal within a diagram.
bad example: suppose in a "level 0" diagram there is an action node labeled "Deliver Order." And, a second action node "Calculate Tax." Those are very different levels of abstraction.

8. NextGen POS Activity Diagram[
cash
payment ]
Enter Cart Items
Calculate Taxes
and Discounts
Customer
Cashier
NextGen POS
Receipt
Shop and Fill
Cart
Submit
Authorization
Request
else
Create Receipt
Hand Over Items
Service
Authorize
Payment

9. Activity Diagrams in the UP
UP disciplines - Business Modeling
its purpose is to understand and communicate the structure and the dynamics of the organization in which a system is to be deployed.
A key artifact of the Business Modeling discipline is the Business Object Model (a superset of the UP Domain Model), which essentially visualizes how a business works, using UML class, sequence, and activity diagrams.