Irrelevant Sample Clauses

Irrelevant. Section 5 – FORMALISATION OF SAFETY REQUIREMENTS USING UML-B In this section we introduce an example formal model to formalise the top level safety requirements for Train Interlocking Systems. The formalisation process starts from the Hazard analysis described in the previous section for the Mini Interlocking System (Xxxxxxxx 2009). The model uses the UML-B notation which is a graphical front-end for the Event-B language and tools. The Rodin tool set includes a prover, which automatically attempts to prove properties about a model whenever it is saved. The properties that are proved include invariant preservation (which may include the safety invariants we are interested in here as well as simple typing properties) and that a refinement still behaves in a way that was permitted by the model it refines. Proofs may not succeed, either because the model is incorrect or because the proof is too difficult for the automatic prover. The Rodin toolset includes an interactive prover, where the user can attempt to guide the automatic prover. The model was automatically proven using the Rodin tool set5. The model consists of the following three refinement steps: • Introduce domain concepts required to describe the 6 hazards above. The idea of this first stage is to describe what would happen if the system was not made to behave safely. If we animated this model we would observe trains crashing and being derailed. The point of this stage is just to introduce the minimal ‘vocabulary’ that will be used in later models. • Introduce assumptions relating to domain concepts not controlled by the interlocking systems and limitations of the interlocking system. The point of this stage is to explicitly describe the safety properties that won’t be dealt with by the interlocking system. This can include assumptions we make about things outside the control of the interlocking system, for example, the actions of a driver or hazards that the interlocking system cannot address and therefore have to be risked. By modelling these things explicitly we are forced to consider them and allow domain experts the chance to object to them. • Introduce safety requirements of the interlocking system. This final stage addresses the safety 5 One proof obligation of the feasibility of an initialisation required a small amount of interactive assistance. requirements that the interlocking system must satisfy. They are expressed as invariant properties that must always hold and a behavioural model th...
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Irrelevant. The reference to SAI criteria (TTS or EC) user for initialising the connection is not relevant for CSL.
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  • Paragraph Headings; Construction Paragraph headings are only used in this Agreement for convenience. Borrower and Silicon acknowledge that the headings may not describe completely the subject matter of the applicable paragraph, and the headings shall not be used in any manner to construe, limit, define or interpret any term or provision of this Agreement. This Agreement has been fully reviewed and negotiated between the parties and no uncertainty or ambiguity in any term or provision of this Agreement shall be construed strictly against Silicon or Borrower under any rule of construction or otherwise.

  • Paragraph Headings The headings of paragraphs contained in this Agreement are provided for convenience only, form no part of this Agreement and shall not affect its construction.

  • Headings and Pronouns The headings of the paragraphs in this Contract are for convenience only and do not affect the meanings or interpretation of the contents. Where appropriate, all personal pronouns used herein, whether used in the masculine, feminine or neutral gender, shall include all other genders and singular nouns used herein shall include the plural and vice versa.

  • Headings and Exhibits The headings herein are for purposes of references only and shall not otherwise affect the meaning or interpretation of any provision hereof. The schedules and exhibits attached hereto and referred to herein shall constitute a part of this Agreement and are incorporated into this Agreement for all purposes.

  • Convenience H-GAC may terminate this Agreement at any time, in whole or in part, with or without cause, whenever H-GAC determines that for any reason such termination is in the best interest of H- GAC, by providing written notice by certified mail to the Contractor. Upon receipt of notice of termination, all services hereunder of the Contractor and its employees and subcontractors shall cease to the extent specified in the notice of termination. The Contractor may cancel or terminate this Agreement upon submission of thirty (30) days written notice, presented to H-GAC via certified mail. The Contractor may not give notice of cancellation after it has received notice of default from H-GAC.

  • Headings and Subheadings The headings and subheadings used in this Agreement are used for convenience only and are not to be considered in construing or interpreting this Agreement.

  • SECTION HEADINGS AND SUBHEADINGS The section headings and subheadings contained in this Agreement are included for convenience only and shall not limit or otherwise affect the terms of this Agreement.

  • Section Headings, Construction The headings of Sections in this Agreement are provided for convenience only and will not affect its construction or interpretation. All references to "Section" or "Sections" refer to the corresponding Section or Sections of this Agreement. All words used in this Agreement will be construed to be of such gender or number as the circumstances require. Unless otherwise expressly provided, the word "including" does not limit the preceding words or terms.

  • Headings and Titles Headings and titles used in this Agreement are used for convenience only and are not to be considered in construing or interpreting this Agreement.

  • Article and Section Headings The article and section headings herein are for convenience of reference only, and shall not limit or otherwise affect the meaning hereof.

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