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c n x _ to _ M N N
[ S U P E R V IS I O N _
D A T A B A S E . ge t _ V L S _S T A T E
= C S C _ S M _ M A S T E R .C S C _
S E R V I C E S .S M _
T Y P E S . S H U T D O W N ]
V L S _ S T A T E _ C H A N G E
c n x _t o _ S N N
c n x _ to _ IN N
C O N S O L E S _ C O N D I T IO N _C H A N G E
L E G A L _ M N N _T O _ I N N _
S T A T E _ C H A N G E _
R E Q U E S T
[ S U P E R V I S IO N _ D A T A B A S E . g et _ V L S _S T A T E = C S C _
S M _ M A S T E R . C S C _ S E R V I C E S .S M _
T Y P E S . M A IN TE N A N C E O R S U P E R V IS I O N _
D A T A B A S E . g et _ S A F E T Y _ K E Y _ P O S IT I O N = C S C _
S M _ M A S T E R . C S C _ S E R V I C E S .S M _
T Y P E S . S E C U R I T Y _ A C T IV E O R ( S U P E R V I S IO N _
D A T A B A S E . g et _ P A A M S _ C O N F I G U R A T I O N = C S C _
S M _ M A S T E R . C S C _ S E R V I C E S .S M _T Y P E S . R E V I S E D _
A U T O N O M O U S A N D S U P E R V IS I O N _ D A T A B A S E . ge t _
C O N S O L E S _ A V A IL A B IL I T Y = C S C _ S M _
M A S T E R . C S C _ S E R V I C E S .S M _T Y P E S . A L L _
U N A V A IL A B L E )]
c n x _ to _ M N N
L E G A L _I N N _ T O _
M N N _ S T A T E _
C H A N G E _ R E Q U E S T
c n x _ to _ S N N
c nx _ t o_ S N N
C O N S O L E S _ C O N D IT IO N _ C H A N G E
I N IT _ O K
V L S _ S T A TE _ C H A N G E
L E G A L _ S N N _ T O _
S N _ S T A T E _
C H A N G E _ R E Q U E S T
c n x _ t o _I N N
[S U P E R V IS I O N _ D A T A B A S E .g e t _V L S _ S T A T E = C S C _ S M _ M A S T E R .C S C _ S E R V IC E S . S M _
T Y P E S .S H U T D O W N O R S U P E R V I S IO N _D A TA B A S E . g e t_ S A F E T Y _ K E Y _ P O S IT I O N =
C S C _ S M _ M A S T E R . C S C _ S E R V I C E S .S M _ T Y P E S . S E C U R I T Y _ A C T IV E O R
(S U P E R V IS I O N _ D A T A B A S E .g e t _P A A M S _C O N F IG U R A T IO N = C S C _ S M _ M A S T E R .C S C _
S E R V I C E S .S M _ T Y P E S . R E V IS E D _A U TO N O M O U S A N D S U P E R V I S IO N _ D A T A B A S E . g et _
C O N S O LE S _ A V A I L A B IL IT Y = C S C _S M _M A S TE R .C S C _ S E R V I C E S . S M _ TY P E S .A L L _
U N A V A I L A B LE ) ]
C O N S O LE S _ C O N D IT I O N _ C H A N G E
c n x _ to _ S N N
MoDeVVa @ ICST 2008 6 / 29
Proof of a subset of properties for a context
The proof : is the verification of properties on the
model depending a context.
To do this we need:
 To transform properties into observer automata
 To merge model, context and observers
 To analyse accessibility of "rejection" states
System model
to be
validated
Context_k
Properties
MoDeVVa @ ICST 2008 7 / 29
Our approach for model formal analysis
Model to be
validated
(UML, AADL, SDL, …)
Context,
formal
properties
(observers)
Composition,
simulation,
(IFx)[Verimag]
Formal
model
(Timed
automata)
transitions
system
Analysis
data return
Safety,
Bounded liveness
Prototype tool (Observer-Based Prover)
Accessibility
Environment analyzing
behavior :
To restrict
the model
behaviors
MoDeVVa @ ICST 2008 8 / 29
Outline
1. Context and Motivations
2. Experimentations : Thales Air Systems, Airbus CSSI
3. Context Description Language (CDL)
4. Conclusion and perspectives
MoDeVVa @ ICST 2008 9 / 29
2 experimentations
Experimentation 1 : AFN (SDL) component validation (AIRBUS, CS-SI)
• 20 requirements proved (as example)
• Found 1 error on the IF2 model ! (buffer too small, but not in an operational case)
Experimentation 2 : SM (UML) component validation (Thales Air Systems)
• 30 significant requirements proved (on 170)
• Found 1 error on the IF2 model ! (2 messages sent instead of 1)
MoDeVVa @ ICST 2008 10 / 29
Air Defence Missile System
Radar
ULT
C2
ADMS
System
Fight control (FCS) Launchers
Missile
MFR
Fight System
CSCI SM
Validation of ADMS component (Thales Air Systems) : SM component
MoDeVVa @ ICST 2008 11 / 29
133 system requirements
188 software requirements
3 automata:
365 states
& 560 transitions
Ada code
generation
38000 lines of code
generated
E M P A R
A U TO _T R A N _
F R O M _ IN N _T O _
M N N . . .
T R A N S I T IO N _
F R O M _S N N _ TO _
S N . . .
T R A N S IT IO N _
F R O M _ M N N _
　
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