# 11.1 Event processing concept

The Event Processing tab is the place in SEAMCAT where you can set the Event Processing Plugin (EPP). The EPP is a plugin that is given access to the EventResults, one by one, as they are produced by the simulation - an EPP can be viewed as an adjacent simulation. An EPP is allowed to inspect the scenario and the EventResult and based on this observation it can produce its own results. Once an EPP is installed in SEAMCAT it can be configured for any scenario possible.

Figure 236 depicts the basic flow of SEAMCAT for a single thread example i.e. One event result (Ri) is calculated at a time in sequence.

[![image.png](https://wiki.cept.org/uploads/images/gallery/2026-04/scaled-1680-/kb2I6OjHnGRwQUIT-image.png)](https://wiki.cept.org/uploads/images/gallery/2026-04/kb2I6OjHnGRwQUIT-image.png)

<div class="rich-media-item mediaSingleView-content-wrap image-align-start css-13moijr" data-layout="align-start" data-media-vc-wrapper="true" data-node-type="mediaSingle" data-renderer-start-pos="614" data-vc="media-single" data-width="400" data-width-type="pixel" id="bkmrk-figure-236%3A-flow-of-"><div class="css-70tz9e"><div data-alt="" data-collection="contentId-492918" data-context-id="492918" data-file-mime-type="" data-file-name="file" data-file-size="1" data-height="160" data-id="11e42160-4996-40e0-b137-1e7ce0d455ab" data-node-type="media" data-renderer-start-pos="615" data-type="file" data-width="1280"><div class="_2rko18qm _vchhusvi _kqswh2mm _ect4ttxp _p12f1osq _c71l1osq _1bsb1qmm _4t3ine4n _1hlmd0i9 _1rquusvi _eg541i5c _mts3kb7n _1ntskb7n _yfmhtlke _5sb1v00u new-file-experience-wrapper" data-media-vc-wrapper="true" data-testid="media-card-view" id="bkmrk-figure-236%3A-flow-of--1"><div class="_1reo15vq _18m915vq _2rko18qm _1e0c1txw _kqswh2mm _p12f1osq _1bsb1osq _4t3i1osq _c71l1osq media-file-card-view" data-cursor="pointer" data-test-media-name="6.png" data-test-progress="1" data-test-source="remote" data-test-status="complete" data-testid="media-file-card-view"><div class="_kqswstnw _1bsb1osq _4t3i1osq _1e0c1txw _2lx21bp4 _1bah1h6o _4cvr1h6o align-center" data-testid="ImageRendererWrapper">![](blob:https://ecowiki.atlassian.net/b83f67c5-4f61-42c1-90b3-1e44221c1d3d#media-blob-url=true&id=11e42160-4996-40e0-b137-1e7ce0d455ab&collection=contentId-492918&contextId=492918&width=1280&height=160&alt=&clientId=113268fe-fe5b-4bc3-8ff3-07965dbf1d18)**Figure 236: Flow of SEAMCAT**</div><div class="_kqswstnw _1bsb1osq _4t3i1osq _1e0c1txw _2lx21bp4 _1bah1h6o _4cvr1h6o align-center" data-testid="ImageRendererWrapper"></div></div></div></div></div></div>Each of the produced event results can be ‘processed’ by a plugin in the sense that it can make additional computation based on the event result and scenario settings. This has huge potential. Basically, there is no limits to how this can be used!

[![image.png](https://wiki.cept.org/uploads/images/gallery/2026-04/scaled-1680-/Hfe95MjLyhvVIqTv-image.png)](https://wiki.cept.org/uploads/images/gallery/2026-04/Hfe95MjLyhvVIqTv-image.png)

<div class="rich-media-item mediaSingleView-content-wrap image-align-start css-14c6218" data-layout="align-start" data-media-vc-wrapper="true" data-node-type="mediaSingle" data-renderer-start-pos="897" data-vc="media-single" data-width="490" data-width-type="pixel" id="bkmrk--2"><div class="css-1yott1c"><div data-alt="" data-collection="contentId-492918" data-context-id="492918" data-file-mime-type="" data-file-name="file" data-file-size="1" data-height="652" data-id="43027ecc-52df-4226-aede-e9a69d18a762" data-node-type="media" data-renderer-start-pos="898" data-type="file" data-width="1280"><div class="_2rko18qm _vchhusvi _kqswh2mm _ect4ttxp _p12f1osq _c71l1osq _1bsb1qmm _4t3ine4n _1hlmd0i9 _1rquusvi _eg541i5c _mts3kb7n _1ntskb7n _yfmhtlke _5sb1v00u new-file-experience-wrapper" data-media-vc-wrapper="true" data-testid="media-card-view" id="bkmrk--3"><div class="_1reo15vq _18m915vq _2rko18qm _1e0c1txw _kqswh2mm _p12f1osq _1bsb1osq _4t3i1osq _c71l1osq media-file-card-view" data-cursor="pointer" data-test-media-name="7.png" data-test-progress="1" data-test-source="remote" data-test-status="complete" data-testid="media-file-card-view"><div class="_kqswstnw _1bsb1osq _4t3i1osq _1e0c1txw _2lx21bp4 _1bah1h6o _4cvr1h6o" data-testid="ImageRendererWrapper">![](blob:https://ecowiki.atlassian.net/a41d315f-1f49-46af-a4ea-09b26757d8e8#media-blob-url=true&id=43027ecc-52df-4226-aede-e9a69d18a762&collection=contentId-492918&contextId=492918&width=1280&height=652&alt=&clientId=113268fe-fe5b-4bc3-8ff3-07965dbf1d18)</div></div></div></div></div></div>**Figure 237: EPP Flow in SEAMCAT**

EPPs have a dedicated thread to run in, and therefore run at the same time as the simulation runs as depicted in Figure 237. EPP inputs are exactly the same for other plugin inputs, but the EPP results are very different. The EPP can produce results like Single values, Vectors, Vector groups, Scatter diagrams, Barcharts.