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PRISM Manual | ThePRISMLanguage / ModelType
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<p><a class='wikilink' href='Main.html'>The PRISM Language</a> /
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</p><h1>Model Type</h1>
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<p>As mentioned above, the PRISM language can be used to describe several types of probabilistic models:
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DTMCs, CTMCs, MDPs and PTAs.
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To indicate which type is being described, a PRISM model should include one of the keywords
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<code><strong>dtmc</strong></code>, <code><strong>ctmc</strong></code>, <code><strong>mdp</strong></code> or <code><strong>pta</strong></code>.
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This is typically at the very start of the file,
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but can actually occur anywhere in the file (except inside modules and other declarations).
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If no such model type declaration is included, the model is by default assumed to be an MDP.
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</p>
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<p class='vspace'><strong>Note:</strong> As mentioned earlier, PRISM also supports probabilistic automata (PAs) [<a class='wikilink' href='../Main/References.html#Seg95'>Seg95</a>], but (mis)uses the terminology Markov decision process (MDP) for this model.
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</p>
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<p class='vspace'><strong>Note:</strong> For compatibility with old versions of PRISM,
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the keywords <code><strong>probabilistic</strong></code>, <code><strong>stochastic</strong></code> and <code><strong>nondeterministic</strong></code>
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can be used as alternatives for <code><strong>dtmc</strong></code>, <code><strong>ctmc</strong></code> and <code><strong>mdp</strong></code>, respectively.
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<h3><a class='wikilink' href='../Main/Main.html'>PRISM Manual</a></h3>
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<p><strong><a class='wikilink' href='Main.html'>The PRISM Language</a></strong>
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</p><ul><li><a class='wikilink' href='Main.html'>Introduction</a>
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</li><li><a class='wikilink' href='Example1.html'>Example 1</a>
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</li><li><a class='selflink' href='ModelType.html'>Model Type</a>
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</li><li><a class='wikilink' href='ModulesAndVariables.html'>Modules And Variables</a>
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</li><li><a class='wikilink' href='Commands.html'>Commands</a>
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</li><li><a class='wikilink' href='ParallelComposition.html'>Parallel Composition</a>
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</li><li><a class='wikilink' href='LocalNondeterminism.html'>Local Nondeterminism</a>
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</li><li><a class='wikilink' href='CTMCs.html'>CTMCs</a>
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</li><li><a class='wikilink' href='Example2.html'>Example 2</a>
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</li><li><a class='wikilink' href='Constants.html'>Constants</a>
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</li><li><a class='wikilink' href='Expressions.html'>Expressions</a>
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</li><li><a class='wikilink' href='Synchronisation.html'>Synchronisation</a>
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</li><li><a class='wikilink' href='ModuleRenaming.html'>Module Renaming</a>
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</li><li><a class='wikilink' href='MultipleInitialStates.html'>Multiple Initial States</a>
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</li><li><a class='wikilink' href='GlobalVariables.html'>Global Variables</a>
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</li><li><a class='wikilink' href='FormulasAndLabels.html'>Formulas And Labels</a>
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</li><li><a class='wikilink' href='PTAs.html'>PTAs</a>
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</li><li><a class='wikilink' href='CostsAndRewards.html'>Costs And Rewards</a>
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</li><li><a class='wikilink' href='ProcessAlgebraOperators.html'>Process Algebra Operators</a>
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</li><li><a class='wikilink' href='PRISMModelFiles.html'>PRISM Model Files</a>
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