An Objective Measure of Cognitive Workload for Signallers Rebecca Crabb Karen Wright Mott MacDonald Andrew Lee Network Rail PANEL 3 VICTORIA AREA SIGNALLING CENTRE THAMESLINK JANURAY 2015 TIMETABLE ID: 402221
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Slide1
Making the Invisible Visible
An Objective Measure of Cognitive Workload for Signallers
Rebecca Crabb, Karen Wright:Mott MacDonaldAndrew Lee: Network RailSlide2
PANEL 3 VICTORIA AREA SIGNALLING CENTRE
THAMESLINK – JANURAY 2015 TIMETABLESlide3
Signallers
Invisible Concern
IWSASWATAll HighVery Busy
ODEC
Task Occupancy
before
48%
# trains - med
IWS
ASWAT
ODEC
Task Occupancy
AFTER
75%
All High
Struggling to keep up
# trains - medSlide4
OBJECTIVE
Physical
CognitiveWorkload ProbeWorkload PrinciplesSUBJECTIVE
ODEC?
AAT/Task Occupancy
PRESTO
IWS
AWSAT
ODEC?
New tool required?Slide5
9
Regulating Location
Routing Junction to Junction
Multiple Train Plans
23 occasions set two routes
High frequency within short space of time
WHAT ARE THE WORKLOAD DRIVERS?
9 set routes in one 5 minute periodSlide6
COMPLEXITY of train movements
B
B
B
A
Following
A
Crossing
A
ConvergingSlide7
COMPLEXITY of train movements
2
141Number & type
of train movement*Number of regulating locationsTime distribution of movements
*Within 2 minutesSlide8
Time
07:00-07:05
07:05-07:10
Junction
Tule
Hill S
Leigham
West Norwood
Tule
Hill S
Leigham
West Norwood
Movement Type
Following (M)
1
2
0
3
1
0
Crossing/ Converging (H)
4
0
1
2
0
3
CREATING A MEASURESlide9
Time
07:00-07:05
07:05-07:10
Junction
Tule
Hill S
Leigham
West Norwood
Tule
Hill S
Leigham
West Norwood
Movement Type
Following (M)
1
2
0
3
1
0
Crossing/ Converging (H)
4
0
1
2
0
3
CREATING A MEASURE
(1
+ 2 + 3 +
1) *
1
= 7
(3+1) – (1+2) = 1 + 1 = 2
{TH+L} 2 *
1
= 2
7 * 2 * 2 = 28Slide10
Time
07:00-07:05
07:05-07:10
Junction
Tule
Hill s
Leigham
West Norwood
Tule
Hill s
Leigham
West Norwood
Movement Type
Following (M)
1
2
0
3
1
0
Crossing/ Converging (H)
4
0
1
2
0
3
CREATING A MEASURE
(1 + 2 + 3 + 1) *
1
= 7
(3+1) – (1+2) = 1 + 1 = 2
{TH+L} 2 *
1
= 2
7 * 2 * 2 = 28
(4 + 1 + 2 + 3) *
2
= 20
(4+1) – (2+3) =
0
+ 1 = 1
{TH+WN} 2 *
2
= 4
20 * 4 * 1 = 80Slide11
Time
07:00-07:05
07:05-07:10
Junction
Tule
Hill
Leigham
West Norwood
Tule
Hill
Leigham
West Norwood
Movement Type
Following (M)
1
2
0
3
1
0
Crossing/ Converging (H)
4
0
1
2
0
3
CREATING A MEASURE
(1 + 2 + 3 + 1) *1 = 7
(3+1) – (1+2) = 1 + 1 = 2
{TH+L} 2 * 1 = 2
7 * 2 * 2 = 28
(4 + 1 + 2 + 3) *2 = 20
(4+1) – (2+3) =
0
+ 1 = 1
{TH+WN} 2 * 2 = 4
20 * 4 * 1 = 80
28 + 80 = 108Slide12
ANALYSING PANEL 3
before
AFTERSlide13
ANALYSING PANEL 3
353% increase between the
average complexity before and after the January 2015 timetable changeBeforeAfterSlide14
IWS
ASWAT
IWS
ASWAT
ODEC
Task Occupancy
AFTER
ODEC
Task Occupancy
before
75%
48%
All High
All High
Very Busy
Struggling to keep up
# trains - med
# trains - med
Complexity Analysis
Complexity Analysis
Signallers
Visible Concern Slide15
ASSIST TURN
Positive
FEEDBACK
SERVICE RUN EFFECTIVELY Slide16
Train service itself not how experience service
Absolute Values
Rather than relativeUnderload ¬ Acceptable ¬ Overload TEST AT DIFFERENT LOCATIONS
Strengthens o
bjective cognitive tools
THE BENEFITS & THE FUTURE
Easy to Create from Timetable