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So far in this series things have been going pretty well. We've looked at sending messages, publishing messages, switching transports, long running processes, and timeouts. But what happens when things go wrong? In this kata we're going to look at how to handle errors in NServiceBus.

In the previous kata we looked at sagas which are a way to coordinate long running processes. In this kata we're going to look at another tool in the NServiceBus toolbox: timeouts. Timeouts are a way to schedule a message to be sent at some point in the future. This is a powerful tool for building out complex processes.

We now have a pretty solid way to send messages, publish messages and we've got those messages flowing over a reliable transport mechanism. Sending and publishing individual messages only gets us so far. We often need a way to coordinate complex processes which involve multiple services. For this NServiceBus has the concept of sagas which some might call process managers.