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Simple CQRS on F# (F-Sharp) 3.0 Based on Greg Young's CQRS: https://github.com/gregoryyoung/m-r/tree/master/SimpleCQRS CQRS is Command and Query Responsibility Segregation -pattern. If you don't know that, use Google or look http://martinfowler.com/bliki/CQRS.html I have separated command side and query side as different projects. This is F# solution. Compared to C#: + Simpler source code + No need for any "InfrastructureCrap" + Domain objects doesn't need to have parameter less constructors + Interactive-driven development What you will need to run this: + Visual Studio 11 (Beta): http://www.microsoft.com/visualstudio/11/en-us Optional: + Reactive extensions: http://msdn.microsoft.com/en-us/data/gg577609 There are two versions of event storage: 1) Pure F# as EventStorage.fs - Uses pure .NET Events with F# Observable as event bus - Uses MailboxProcessor ("agents"/message passing) as event storage 2) F# with Reactive Extensions as EventStorageRx.fs - Uses reactive framework Subject<T> as event bus - Uses reactive framework ReplaySubject<T> as event storage Although technical concept is different, the functionality is identical. You can run this with F# interactive, directly from files and/or using Script.fsx. This QuerySide is just in-memory one as in Greg's example. I suggest using F# Type Providers in QuerySide with real database...