---
title: "activity-diagrams"
aliases: 
tags: 
- info201
---

[](https://i.imgur.com/zpwJJ5d.png)
[](https://i.imgur.com/PKHcpMx.png)


### 3.4 Activites and transitions

[](https://i.imgur.com/1G14Ntn.png)

- activities
	- take place over some pariod of time
	- linked by transitions (arrows)
	- only one starting point potentaily many ending conditions

- Transitions
	- have guard conditions that must be satisfied before the transition can occur

### 3.5 Decision points
- represent conditional branching
- two or more alternative transitions depending on condition
- every transiiton exiting the decision point must have a guard condition

[](https://i.imgur.com/KCufkgX.png)

### 3.6 Synchonisation bars
- represents two or more activites running in parallel
- transitions can be split into mutiple paths and recombined later
- if a workflow is split then it must be recombined on the same diagram

[](https://i.imgur.com/IVfP7vt.png)

### 3.7 swim lanes
- same as BPMN
- show who is responsible for a process
- can represent
	- business organisations
	- depts
	- people (actors)
- can simplify processes

[](https://i.imgur.com/cRiZjtE.png)


### 3.8 relationships to use cases
- use case diagrams show the high level interactions between actors and cases
- high level activity diagrams show the sequence of use cases within a workflow

[](https://i.imgur.com/3b9f2va.png)


#### 3.8.1 example

[](https://i.imgur.com/dKHjIdu.png)

[](https://i.imgur.com/yCAjqkZ.png)

[](https://i.imgur.com/RifaVaq.png)

### 3.9 Example producing a book

[](https://i.imgur.com/X5aFAt2.png)

[](https://i.imgur.com/AKVAshk.png)