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Measuring the Situation Awareness Provision Capability in Complex Socio-Technical Systems with STAMP

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Transcript of Measuring the Situation Awareness Provision Capability in Complex Socio-Technical Systems with STAMP

The Risk SA Provision...
is attributed to:
(1) the mental models & accident scenarios
(2) the sensors
(3) the mechanisms for message transmission


is inherent; it
stems from:
(a) the number,
(b) type, and
(c) characteristics
of the system elements
that together shape the different system parts


is, thus,
tangible
...
...is dynamic
Conclusion
IDEAL
STPA:
99
total
EWaSAP:
114
total

REAL
from STPA:
45
absent
from EWaSAP:
75
absent

RiskSOAP value - distance from the
ideal:
0.7207

'Situation Awareness'
A hazy shade of safety
> 30 definitions

7 models

9 categories for direct measurement


Measuring the Situation Awareness Provision Capability in Complex Socio-technical Systems with STAMP





-
STPA & EWaSAP
: define the "ideal" system composition & measure the dissimilarity between the ideal and the real system's composition

-
Thinking outside the box:
wrong to examine (a) broken individual components & (b) attribute blame to human operators for ‘losing situation awareness’
(Dekker 2015; Salmon et al. 2015)

Towards a shift: (a) risk SA provision capability, (b) tangible system elements
radar under
maintenance
Distributed Situation Awareness (DSA)
The risk SA provision capability changes
as much as the system composition changes:

degradation
OR
enhancement

Emergent property
: DSA is not just a state of mind; it is a systems endeavour
(Stanton et al. 2009)


No one system agent has a
complete picture of a situation

- just a facet of it
at any point in time
...true story!
one man's practice
RiskSOAP Methodology
Measure the Risk SA Provision Capability

-The Objective-
Case 2: Überlingen collision
IDEAL
STPA:
127
EWaSAP:
152

REAL
from STPA:
97
absent
from EWaSAP:
108
absent

RiskSOAP value - distance from the ideal:
0.8471
overall numerical results
Case 1: ACROBOTER robot
mikechat@civil.duth.gr
mikelachatzimichailidou@gmail.com
Maria
Mikela
Chatzimichailidou
Stefanos Katsavounis
Ioannis M. Dokas

mikechat@civil.duth.gr
mikelachatzimichailidou@gmail.com
Department of Civil Engineering
Democritus University of Thrace
Xanthi, Greece
...reflects the
inherent
, according to the system design and development,
capability
of each system part to
provide its agent with SA about the presence of system threats and vulnerabilities
, possibly leading to accidents
Suggestion to meet the objective...

The RiskSOAP methodology & indicator
:
a measurable quantity that indicates how much the system, as it is designed to function, augments the awareness of its threats and vulnerabilities

Maximum distance/dissimilarity
= 1
- why?
positive correlation between safety & awareness
the real system version diverges too much from what the ideal ACROBOTER should have been
Full transcript