1<!doctype html><html lang=en><head><meta charset=utf-8><title>The Society | The Society for Imprecise Probabilities: Theories and Applications</title><meta name=viewport content="width=device-width,initial-scale=1"><link rel=stylesheet href=/stylesheet.min.d6e4f491d84b001821bf1578658baa04083bd6faae80d54913fb0d9be23193e3.css integrity="sha256-1uT0kdhLABghvxV4ZYuqBAg71vqugNVJE/sNm+Ixk+M=" crossorigin=anonymous>
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1<noscript><img src="https://sipta.goatcounter.com/count?p=/%2fsociety%2f"></noscript><meta name=google-site-verification content="NzHR_cyx0yQp4-wA7seWFC4JGoT9ARtVwHyqUeeqL-0"><meta name=msvalidate.01 content="3F88B973E4E776E4381B343016FDA7DD"></head><body><div class=grid><input type=checkbox id=toggle><header><div class=SIPTA><a href=https://sipta.org/>S<span class=IP>IP</span>TA</a></div><div class=full>The Society for Imprecise Probabilities:<br>Theories and Applications</div></header><label class=hamb-label for=toggle><span class=navicon></span></label><nav><ul><li><a href=/>Home</a></li><li><a href=/news/>News</a></li><li><a href=/society/>The Society</a></li><ul class=sub-menu><li><a href=/society/executive-committee/>Executive committee</a></li><li><a href=/society/articles-and-bylaws/>Articles and bylaws</a></li><li><a href=/society/meetings/>General meetings</a></li></ul><li><a href=/events/>Events</a></li><ul class=sub-menu><li><a href=/events/isipta/>ISIPTA</a></li><li><a href=/events/sipta-school/>SIPTA School</a></li><li><a href=/events/sipta-seminars/>SIPTA Seminars</a></li><li><a href=/events/related-events/>Related events</a></li></ul><li><a href=/info/>Info and resources</a></li><ul class=sub-menu><li><a href=/info/mailinglist/>Mailing list</a></li><li><a href=/info/twitter/>Twitter</a></li><li><a href=/info/stackexchange/>Stack exchange</a></li><li><a href=/info/documentation/>Documentation</a></li><li><a href=/info/software/>Software</a></li><li><a href=/info/kuznetsov/>Kuznetsov's book</a></li><li><a href=/info/archive/>Archive</a></li></ul><li><a href=/blog/>Blog</a></li></ul></nav><main><h1>The Society</h1><p>The <em>Society for Imprecise Probabilities: Theories and Applications</em> (SIPTA) is a not-for-profit organisation that aims to promote research on imprecise probabilities. It does so by organising <a href=../events>events</a> that bring together researchers, by creating <a href=../info>resources</a> for information, dissemination and documentation, and by making other people aware of the potential of imprecise probabilities. SIPTA is run by its <a href=executive-committee>executive committee</a>, according to the directives outlined in its <a href=articles-and-bylaws>articles and bylaws</a>. Changes to these articles and bylaws are voted upon at the <a href=meetings>SIPTA general meetings</a>.</p><h3 id=scope>Scope</h3><p>The term <a href=http://en.wikipedia.org/wiki/Imprecise_probability>imprecise probabilities</a> is understood in a very wide sense. 2It is used as a generic term to cover all mathematical models which measure chance or uncertainty without sharp numerical probabilities. 3This includes both qualitative models (such as comparative probabilities, partial preference orderings and choice functions) and quantitative ones (such as sets of probabilities, interval probabilities, belief functions and upper and lower previsions). 4Imprecise probability models are needed in inference problems where the relevant information is scarce, vague or conflicting, and in decision problems where preferences may be incomplete.</p><h3 id=history>History</h3><p>SIPTA was created in February 2002. It has its roots in the <em>Imprecise Probabilities Project</em>, conceived in 1996 by Peter Walley and Gert de Cooman, and its creation has been encouraged by the success of the <a href=../events/isipta/>ISIPTA</a> conferences. Some documents from the early days of SIPTA are still available in the <a href=../info/archive>SIPTA archive</a>.</p></main><footer><span class=update>Last update 14 September 2026</span> 5<span class=socials><a href=https://twitter.com/SIPTAtweets target=_blank decoration=none><svg viewBox="0 0 24 24" aria-hidden="true" class="twitter-bird"><g><path d="M23.643 4.937c-.835.37-1.732.62-2.675.733.962-.576 1.7-1.49 2.048-2.578-.9.534-1.897.922-2.958 1.13-.85-.904-2.06-1.47-3.4-1.47-2.572.0-4.658 2.086-4.658 4.66.0.364.042.718.12 1.06-3.873-.195-7.304-2.05-9.602-4.868-.4.69-.63 1.49-.63 2.342.0 1.616.823 3.043 2.072 3.878-.764-.025-1.482-.234-2.11-.583v.06c0 2.257 1.605 4.14 3.737 4.568-.392.106-.803.162-1.227.162-.3.0-.593-.028-.877-.082.593 1.85 2.313 3.198 4.352 3.234-1.595 1.25-3.604 1.995-5.786 1.995-.376.0-.747-.022-1.112-.065 2.062 1.323 4.51 2.093 7.14 2.093 8.57.0 13.255-7.098 13.255-13.254.0-.2-.005-.402-.014-.602.91-.658 1.7-1.477 2.323-2.41z"/></g></svg></a> 6| <a href=https://www.youtube.com/channel/UCPER8Dfil66KZCYlsK86XCQ target=_blank decoration=none><svg viewBox="0 0 30 20" aria-hidden="true" class="youtube-play"><g><path d="M27.9727 3.12324C27.6435 1.89323 26.6768.926623 25.4468.597366 23.2197.224288e-6 14.285.0 14.285.0S5.35042.224288e-6 3.12323.597366C1.89323.926623.926623 1.89323.597366 3.12324.224288e-6 5.35042.0 10 0 10s.224288e-6 4.6496.597366 6.8768c.329257 1.23 1.295864 2.1966 2.525864 2.5258C5.35042 20 14.285 20 14.285 20s8.9347.0 11.1618-.5974c1.23-.3292 2.1967-1.2958 2.5259-2.5258.5974-2.2272.5974-6.8768.5974-6.8768S28.5677 5.35042 27.9727 3.12324z"/><path d="M11.4253 14.2854l7.4224-4.285-7.4224-4.28507V14.2854z" id="play"/></g></svg></a></span></footer></div></body></html>
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