By Egon Börger, Robert Stärk
Quelli che s'innamoran di pratica senza scienzia sono come 'l nocchieri ch'entra in navilio sanza timone o bussola, 1 che mai ha certezza dove si vada. - Leonardo da Vinci Ich habe oft bemerkt, dass wir uns durch
allzuvieles Symbolisieren 2 die Sprache fu ¨r die Wirklichkeit untu ¨chtig machen. - Christian Morgenstern this can be where to precise our thank you. firstly we thank all those that through the years have actively contributed
to shaping the radical software program layout and research technique defined during this booklet. they're too quite a few to be pointed out right here. all of them seem in a roundabout way or the opposite at the following pages, particularly within the bibliographical
and historic Chap. nine that are learn independently of the ebook. We then thank those that have helped with unique serious reviews at the draft chapters to form the way in which our arguments are offered during this e-book: M. B¨
orger (Diron Mu ¨nster), I. Craggs (IBMHursley),G. DelCastillo(SiemensMunc ¨ hen),U. Gl¨ asser(SimonFraser college, Vancouver,Canada),J. Huggins(Kettering University,Michigan, USA), B. Koblinger (IBM Heidelberg), P. Pa
¨ppinghaus (Siemens Munc ¨ hen), A. Preller (Universit´ e de Montpellier, France), M. -L. Potet (INP de Gre- ble, France),W. Reisig (Humboldt-Universit¨ at zu Berlin, Germany),H. Rust (Universit¨ at Cottbus, Germany), G.
Schellhorn (Universit¨ at Augsburg, G- many), B. Thalheim (Universit¨ at Cottbus, Germany) and a dozen pupil generationsat Universita `di Pisa. We thankM. Barmet(ETH Zur ¨ ich)for her suggestions of the workouts in Chap. 8.
We additionally thank L.
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Extra resources for Abstract state machines..A method for high-level system design and analysis
Whether the meaning of these functions is determined by a mere signature (“interface”) description, or by axiomatic constraints, or by an abstract specification, or by an explicit or recursive definition, or by a program module, depends on the degree of information-hiding the specifier wants to realize. Static 0-ary functions represent constants, whereas with dynamic 0-ary functions one can model variables of programming (not to be confused with logical variables). Dynamic functions can be thought of as a generalization of array variables or hash tables.
Message passing via channels) to describe the exchange of information between an agent and its environment (and similarly between arbitrary agents in the case of a multi-agent machine). As with static functions the specification of monitored functions is open to any appropriate method. This feature helps the system designer to control the amount of information which he wants to give to the programmer. The only (but crucial) assumption made is that in a given state the values of all monitored functions are determined.
2 pictorially summarizes the different verification and validation techniques which can be applied to ASM models in the design hierarchy leading from a ground model to executable code. 2 Working Definition 27 Fig. 3 Integrating ASMs into the V-scheme REQUIREMENTS CAPTURE customer feedback (ground model/doc) SYSTEM ANALYSIS Ground Model (Sw Arch) Acceptance Test Plan validation and verification at each level SOFTWARE DESIGN Module Architechture Module Test Plan CODING Compiled Executable Code MAINTENANCE SYSTEM TEST (against specification& test plan for ground model) MODULE TEST (against specification of module functionality) UNIT TEST (test of functions) kind ASMs offer from the ground model through the intermediate levels to the implementation.
Abstract state machines..A method for high-level system design and analysis by Egon Börger, Robert Stärk