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== ''Pairs'' ==
The scenario for ''Pairs'' is an investment firm where a number of analysts interact with an enterprise trading system responsible for automating and optimizing the execution of orders in stock markets. Users of the system pose trading strategies which are continuously matched against live stock market data. The task of an event processing system implementing ''Pairs'' is thus to process this tick stream and compute, for each running strategy, a set of indicators, signalizing whenever those reveal an opportunity to capitalize on market inefficiencies. 

''Pairs'' was designed to assess the ability of CEP systems in processing increasingly larger number of continuous queries and event arrival rates while providing quick answers – three quality attributes equally important for an event processing engine. For that, the benchmark exercises a wide range of features commonly found in most event processing applications, including:
* Filtering, aggregation, and correlation of events;
* Detection of event patterns and trends;
* State maintenance;
* Large number of simultaneous queries (increasing with the system scale);
* Changing load conditions.

The most updated specification of ''Pairs'' (revision 0.2) can be found [http://bicep.dei.uc.pt/images/b/ba/Pairs_Benchmark_%28rev._0.2%29.pdf here]. The benchmark kit, required to run ''Pairs'', can be donwloaded from the [http://bicep.dei.uc.pt/index.php/Tools Tools] section.