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Automated Software Engineering

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15.12.2017

Tool support for assurance case development

verfasst von: Ewen Denney, Ganesh Pai

Erschienen in: Automated Software Engineering | Ausgabe 3/2018

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Abstract

Argument-based assurance cases, often represented and organized using graphical argument structures, are increasingly being used in practice to provide assurance to stakeholders, e.g., regulatory authorities, that a system is acceptable for its intended use with respect to dependability and safety concerns. In general, comprehensive system-wide assurance arguments aggregate a substantial amount of diverse information, such as the results of safety analysis, requirements analysis, design, verification and other engineering activities. Although a variety of assurance case tools exist, many desirable operations on argument structures such as hierarchical and modular abstraction, argument pattern instantiation, and inclusion/extraction of richly structured information have limited to no automation support. To close this automation gap, over the past four years we have been developing a toolset for assurance case automation, AdvoCATE, at the NASA Ames Research Center. This paper describes how AdvoCATE is being engineered atop formal foundations for assurance case argument structures, to provide unique capabilities for: (a) automated creation and assembly of assurance arguments, (b) integration of formal methods into wider assurance arguments, (c) automated pattern instantiation, (d) hierarchical abstraction, (e) queries and views, and (f) verification of arguments. We (and our colleagues) have used AdvoCATE in real projects for safety assurance, in the context of unmanned aircraft systems.

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Strictly speaking, road vehicles do not undergo regulatory certification in the same way as civil aircraft; rather, they are qualified by the manufacturer as meeting an applicable safety standard.

In general, an assurance case provides assurance of broad system concerns, such as dependability, safety, and security; a safety case is a specialization of an assurance case for system safety assurance.

There are also different (but compatible) notions of safety case (US Department of Transportation, Federal Aviation Administration (FAA) 2013; Berthold et al. 2014) in which there is no explicit requirement for presenting structured arguments.

In this paper, we will use the terms safety argument, and safety case interchangeably when the distinction between the two is not significant. Also note that the scope of our work here applies to assurance cases in general, although we will focus primarily on safety assurance.

Also see Sect. 7.1 for more details on existing tools.

In the rest of the paper, we will use pattern to mean an argument pattern. Also see Sect. 4, and Denney et al. (2013a).

Or, convince and communicate to the relevant stakeholders.

See Sect. 4 for more details. We have opted to use the GSN, although other appropriate notations could also have been used.

We note that the data given in Fig. 2 is not comprehensive. In actual practice, this abstract methodology is replaced by concrete processes, activities, and the corresponding data, e.g., as recommended in civil aviation guidelines for system development and safety assessment (S-18, Aircraft And System Development And Safety Assessment Committee 1996, 2010). Additionally, we note that this methodology addresses safety assurance prior to system operations, and is applied towards facilitating the decision to release a system into service. A lifecycle approach to safety assurance (Denney et al. 2015a) also takes into account operational safety measures and safety performance, although we will not address that here.

The process shown in Fig. 3 is different from (but compatible with) both the six-step method for developing an argument structure (Goal Structuring Notation Working Group 2011), and the safety case development methodology in Bishop and Bloomfield (1998).

For more details on argument patterns, see Sect. 4.2.

Additionally, assumptions can also be made about the assurance techniques employed.

We have also identified and specified additional requirements that cover the remainder of the functionality offered by AdvoCATE, although those are out of scope here.

Status is defined as a set since, as we will see later, nodes can have multiple status values. Here, \( tbd \) represents the ‘to be developed’ status.

A partial argument can have multiple roots, whereas a full argument structure has a single root.

Formally, we define a strict notion of argument where goals require intermediate strategies (thus spelling out explicitly why subgoals follow from parent goals), and separate goals cannot share evidence. In practice, both these conditions are often violated and can be captured with a more relaxed definition. The tool allows both conventions.

Though not so common in practice, bounds are a natural generalization of optionality and multiplicity and can be used, for example, to require complementary strategies or evidence (as a lower bound on number of branches) or to limit argument complexity (by placing an upper bound).

Note that the open and closed views of a hinode, respectively, serve to visually display or hide the node contents. In our current implementation, a hinode cannot be empty regardless of whether it is displayed in its open or closed view, although as part of future work we plan to allow the creation of empty hinodes.

Strictly speaking, they relax some conditions on the definition of modules and add others.

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Henceforth, we will use argument (or pattern) when we mean the model of the argument (or pattern), i.e., the instance of the diagram metamodel.

The only way in which cycles can be introduced into arguments is by pasting a pattern with a cycle into an argument.

Here, note that the multiple roots errors shown in the issues panel has identified two goal nodes with the same identifier. However, since the check is performed across all the open projects, the errors exist in separate arguments; the path to those arguments can be seen by expanding the size of panel, but has not been shown in Fig. 11.

The patterns shown here are more concise versions of those given in Denney and Pai (2015).

Note that by hierarchically abstracting such an argument into a closed hierarchical evidence node (see Sects. 4.3 and 6.3.2), the result is an argument which is both structurally and semantically identical to that produced from the traditional approach of referring to the results of formal methods using evidence nodes.

AdvoCATE provides a Show/Hide feature—as shown by the eponymous option in the context menu in Fig. 17a—with which a user can selectively show and/or hide a node, paths to/from a node, and children of a node.

As well as, more generally, to other formal methods paradigms, so that techniques such as formal refinement or program synthesis could be integrated, although that would require a different workflow.

In fact, we can also leverage the use of metrics computation during property verification (Sect. 6.5).

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This distinction has sometimes been misunderstood in the literature (Graydon 2015).

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Titel: Tool support for assurance case development
verfasst von: Ewen Denney
Ganesh Pai
Publikationsdatum: 15.12.2017
Verlag: Springer US
Erschienen in: Automated Software Engineering / Ausgabe 3/2018
Print ISSN: 0928-8910
Elektronische ISSN: 1573-7535
DOI: https://doi.org/10.1007/s10515-017-0230-5

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