This document describes the key elements of activity diagrams including activities, transitions, guard conditions, decisions, concurrency, and notations. Activities represent steps in a process, transitions connect activities, and guard conditions restrict transitions. Decisions can involve simple true/false tests or choices between options. Activity diagrams can also model the synchronization of concurrent activities and splitting of process flow.

2. Introduction
 It provides a visual evaluation of use case narration.
It identifies-
Normal flow
Alternate flow
It describes-
Sequential tasks
Conditional tasks
concurrency

3. Notations
Activity
 A step represent in the process where some tasks/work
is being done.
 That work can be-
 Calculation
 Finding some data
 Manipulating information

4. Transition
 Activities are linked by transition arrows connecting
each acting.

5. Guard conditions
 Can be assigned to a transition to restrict the use of a
transition.
 The guard condition must be tested true before
transiting to the next activity.
Withdraw
cash
Terminate
transition
( Cash has been
collected)

6. Decisions
 Diamond in the decision item can be simple true false
test.
 Decision may involve a choice between a set of
options.
Sufficient
conditions
Insufficient
conditions

7. Activity Diagrams can model
Concurrency
 Synchronization of multiple activities
 Splitting the flow of control into multiple threads
O p e n
I n c i d e n t
A l l o c a t e
R e s o u r c e s
C o o r d i n a t e
R e s o u r c e s
D o c u m e n t
I n c i d e n t
A r c h i v e
I n c i d e n t
SynchronizationSplitting

8. Link For Activity Diagram