Contracts for System Design

Benveniste, Albert; Caillaud, Benoît; Ničković, Dejan; Raclet, Jean-Baptiste; Reinkemeier, Philipp; Sangiovanni‐Vincentelli, Alberto; Damm, Werner; Henzinger, Thomas A.; Larsen, Kim Guldstrand

doi:10.1561/9781680834031

Cited by 115 publications

(167 citation statements)

References 132 publications

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“…However, their adoption in industry is limited. A major challenge is the absence of a comprehensive modeling formalism for CPS that addresses complexity and heterogeneity Sangiovanni-Vincentelli, Damm, and Passerone 2012; Benveniste et al 2012.…”

Section: Contractsmentioning

confidence: 99%

“…We use contracts also to formalize and reason about refinement between two different abstraction levels in the PBD process [Nuzzo et al, 2012;Benveniste et al, 2012]; for this reason, we refer to this type of contracts as vertical contracts. Vertical contracts can be used to prove that : a set of requirements are consistent, that is, there exists an implementation satisfying all of them and an aggregation of components refines a specification, that is, it implements the specification and is able to operate in any environment admitted by it.…”

Section: Contractsmentioning

confidence: 99%

“…More formally, a component M implements the static A/G-contract  if and only if A ∧ M ⇒ G holds. As explained in [Benveniste et al, 2012], an implementation of  is also an implementation of  ′ = ( A , G ∨ ¬ A ) which is said to be saturated, or in canonical form.…”

Section: Csl4p Semanticsmentioning

confidence: 99%

“…These requirements justify our choice of a language based on two important design paradigms: contract-based design (CBD) [Giese, 2000;Benveniste et al, 2008;Benveniste et al, 2012] (R1-R4) and platform-based design (PBD) [Sangiovanni-Vincentelli, 2003Pinto et al, 2004] (R1, R2, R5). Both paradigms will be reviewed in this article and their features will be linked to the requirements stated above.…”

mentioning

confidence: 99%

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CSL4P: A Contract Specification Language for Platforms

Pinto¹,

Sangiovanni‐Vincentelli

2017

Syst Eng

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The contract‐based design formalism supports compositional design and verification, and generalizes many other languages where components are defined in terms of their assumptions and guarantees. Most languages and tools for contract‐based design provide constructs to define, instantiate, and connect contracts, but fall short in capturing families of potential architectures in a flexible way. This article presents a Contract‐Based Specification Language for Platforms (CSL4P). A platform comprises a set of contract types and a set of constraints called rules. Contract types can be instantiated and connected to form platform instances. While the meaning of composition is predefined in most languages, composition rules are used in CSL4P to provide a finer control on the semantics of interconnections. In addition, the separation of contract types from rules allows users of CSL4P to define different platforms out of the same set of components. This article describes syntax and semantics of the language, a development environment, which includes a compiler and a verification back‐end, and an application example.

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Section: Contractsmentioning

confidence: 99%

Section: Contractsmentioning

confidence: 99%

Section: Csl4p Semanticsmentioning

confidence: 99%

mentioning

confidence: 99%

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CSL4P: A Contract Specification Language for Platforms

Pinto¹,

Sangiovanni‐Vincentelli

2017

Syst Eng

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“…Chief among these is the necessity to define and validate dependability in the face of the emergent behaviour that characterizes systems of systems (Maier 1996) (Kopetz et al 2015). Many approaches to SoS dependability have built on approaches to system dependability, and contractual styles similar to the one we propose here are popular -for example (Bryans et al 2013), (Benveniste et al, 2012), (Damm et al 2011). These trace their origins to the Design by Contract approach introduced by Meyer (Meyer 1998).…”

Section: Related Workmentioning

confidence: 99%

Applying Model‐based SE Techniques for Dependable Land Systems

Payne

Fitzgerald

Bryans

et al. 2016

INCOSE International Symp

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A System of Systems (SoS) is a group of independent constituent systems that by their interactions together deliver an emerging capability on which reliance is placed. In the UK Ministry of Defence Land domain, the appetite for uncertainty caused by SoS dependencies is particularly low. Dependability and assurance are therefore vital, both in the integration and interoperability of individual constituent systems, and at the level of the SoS as a whole. This paper presents the findings from a study, asking whether model‐based engineering technologies could potentially deliver a pragmatic method for Land Open Systems Architecture (LOSA) SoS verification and assurance. We conclude that existing model‐based SoS and Cyber‐Physical Systems engineering techniques could potentially deliver a basis for LOSA SoS requirement engineering, design, verification and assurance. However, the techniques studied are at varying levels of maturity and therefore we identify areas of future work that could inform the ongoing research and experimentation programmes for LOSA and others across defence.

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Modular Semantically Integrated System Modelling

Natarajan

Chaudhuri

Kumar

2019

INCOSE International Symp

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In current practice, we engineer systems using modular, composable components. However, when we model systems in languages such as SysML, we build a single model of the entire deliverable system (such as a radio telescope). Though the model is of course hierarchical, consisting of multiple levels of description, these are not quite independent models that can be composed modularly. For example, if we acquire a power supply off-the-shelf, ideally we would like the supplier to provide us a model of the power supply that can be integrated into our overall system model, reflecting the same concerns involved in integrating the power supply into our solutions. If we have distributed teams, can they create separate models that are composable? Can model integration be the early version of system integration?This paper discusses how modelling can support modular composability using roles: placeholders for other entities that the entity being modelled depends on in order to deliver its targeted behaviour. All the necessary assumptions relating to the role are captured as role profiles. Model composition then involves binding these context roles to models of actual concrete entities that fit the assumptions. Our paper presents an illustrative example of compositional modelling of a radio telescope, and discusses some of the issues involved in binding. It goes further to indicate how these system models can be linked to relevant domain knowledge frames, and also linked to observations of the system behaviour. The result is a SystemMap: modular, composable knowledge-centric models that enable capture of all the information and knowledge relating to a system, linked by a network of semantic relationships that enable internal consistency checking, as well as model and knowledge refinement based on consistency with observed real-world behaviours. Current Practice and MotivationModel-based systems engineering (MBSE) is practised widely, nevertheless there are gaps in current MBSE capabilities. These gaps become evident if we take a brief look at MBSE usage in a typical state-of-the-art systems engineering project.

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Contracts for System Design

Cited by 115 publications

References 132 publications

CSL4P: A Contract Specification Language for Platforms

CSL4P: A Contract Specification Language for Platforms

Applying Model‐based SE Techniques for Dependable Land Systems

Modular Semantically Integrated System Modelling

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