Extra Video Clip E.1

Concurrency

Business Process Modeling and Analysis:

An openHPI Course by Mathias Weske

Mathias Weske openHPI course on Business Process Modeling and Analysis 2013 E.1 - 2

Sequential Execution

A set of process activities are sequential, if the process model prescribes that they are always executed in a

sequential order

- At each point in time, at most one activity is running

Sequence flow example

Mathias Weske openHPI course on Business Process Modeling and Analysis 2013 E.1 - 3

Sequential Execution

Time diagrams illustrate process instances

Mathias Weske openHPI course on Business Process Modeling and Analysis 2013 E.1 - 4

Sequential Execution

When we analyze processes, we look at traces

- We abstract from the running phase

- We reduce the interval to a point!

Thereby we can create trace(s)

Mathias Weske openHPI course on Business Process Modeling and Analysis 2013 E.1 - 5

Sequential Execution

XOR split example

Time diagrams

Traces

Mathias Weske openHPI course on Business Process Modeling and Analysis 2013 E.1 - 6

Concurrent Execution

A set of process activities are concurrent, if the process model prescribes that they can be executed

independently from each other with arbitrary interleaving

- At each point in time, multiple concurrent activities might be

running

AND split example

Mathias Weske openHPI course on Business Process Modeling and Analysis 2013 E.1 - 7

Concurrent Execution

AND split example

Sample time diagram

Traces

Mathias Weske openHPI course on Business Process Modeling and Analysis 2013 E.1 - 8

Concurrent Execution

OR split example

- If no conditions are given,

we have to investigate

all possible executions

Sample time diagram

Traces

- For process instances in which branch D was not selected

Mathias Weske openHPI course on Business Process Modeling and Analysis 2013 E.1 - 9

Summary Extra Video Clip E.1

Sequential execution

- Sequence flow

- XOR Split

Time diagrams

- Illustrate temporal aspects

Traces

- Abstract from running states

- Used for process analysis

Concurrent execution

- AND Split

- OR Split

Investigate all possible executions