This tutorial provides step-by-step guide on how to edit the unsafe control actions table in STPA safety analysis project in XSTAMPP

1. Tutorial-4
Editing Unsafe Control Actions
of STPA project in XSTAMPP
September 2016
Asim
Abdulkhaleq

2. University of Stuttgart 2
Control
Actions TableControl Actions Table
• When you dragged and dropped a control action into the control
structure diagram, XSTAMPP will automatically save them into the
control actions table with information of source and destination
components.
You can here add a description of each
control action

3. Unsafe
control
actions Table
Unsafe Control Actions Table
• The control actions will also be appeared in the first column of the
unsafe control actions.
• Each control action should be evaluated within four hazardous types:
• Not Providing causes hazard
• Providing causes hazard
• Wrong timing or order causes hazards
• Stopped too soon or Applied too long
• If an item in the table is hazardous, then you have to assign which
hazards from the hazards table can cause this unsafe control actions,
otherwise, it will be considered as not hazardous
University of Stuttgart 5

4. Unsafe
control
actions Table
Editing Unsafe Control Actions
• You can edit an unsafe control action by clicking on the add button
University of Stuttgart 5
• To link hazard to the unsafe control action, click on the button and select from the
context menu a hazard. The code number of the UCA will be appeared.
You can choose from here a hazard.
To add more hazards, you have to click on the link
button again

5. Unsafe
control
actions Table
Delete an Unsafe Control Action
• You can delete an unsafe control action by clicking on the button
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• You have to confirm the deleting command by clicking on OK button, then all
information of this unsafe control action will be deleted

6. University of Stuttgart 6
Create a new
STPA project
Searching for An Unsafe Control Action
• You can search for an unsafe control action by using different search
filters such as control action, or unsafe control action or the UCD
ID.
• You have to type the text in the search text box e.g. Accelerate

7. University of Stuttgart
Exporting
Unsafe
Control Actio
Table
Exporting the unsafe Control Actions Table
• You can export the control action table as image or CSV sheet or
PDF by click on the Export button in main toolbar.
• Next, you have to select the type of exporting: STPA DATA Sheets,
or Images or PDF. Then click on Next button.

8. University of Stuttgart 8
Exporting
Unsafe
Control
Actions Table
Exporting Unsafe Control Action Table as
an CVS Sheet
• As default, the name of current project will be appeared at the top
of the list.
• Then, you have to select the type of separators of CVS sheets and
location of exporting the file.
Choose the project name which you want to export its data
Choose one type of separators of CVS sheets
Choose the destination path to export the data in.

9. University of Stuttgart 9
An IssueAn Issue in Editing of Unsafe Control Actions
Table
• In the version of Mac OS X, some of users faced a problem when
they typed a text in a cell of the table, then the text will not save it.
• This issue did not appear on Windows or Linux.
• Solution:
• You have to type your text and does not move the mouse over
the current cell or the unsafe control action table. Then, press
Enter button to save the content.
• You can also contact with me if you need more information

10. Thank you!
e-mail
phone +49 (0) 711 685-
fax +49 (0) 711 685-
Universität Stuttgart
Asim Abdulkhaleq, Ph.D Candidate
88 458
88 380
Institute of Software Technology, Software Engineering Group
asim.abdulkhaleq@informatik.uni-stuttgart.de
The slides will be also available at the website www.xstampp.de