Following on from the success of last year, this annual event for London's architect community will have architectural innovation as a theme this year, and particularly CQRS. At the DDD eXchange we will feature leading thinkers and architects who will share their experience and Eric Evans is the programme lead.

1. Define DDD Eric Evans domainlanguage.com

2. DDD is a Set of Driving Principles Focus on the Core Domain. Explore models in a creative collaboration of domain practitioners and software practitioners. Speak a Ubiquitous Language within an explicitly Bounded Context.

3. DDD isA Pattern Language A set of interrelated problem/solution pairs that have helped teams realize the principles. A vocabulary and conceptual framework for discussing domain modeling and design.

4. Define Domain domain A sphere of knowledge, influence, or activity.

5. Define Model model A system of abstractions that describes selected aspects of a domain.

6. Mercator Map

8. The model we want… Helps us solve specific problems in our domain. Is not necessarily “realistic”. Forms the basis of a language. Is not the only model.

9. Define Ubiquitous Language ubiquitous language A language structured around the domain model and used by all team members to connect all the activities of the team with the software.

10. Define Model context The setting in which a word or statement appears that determines its meaning.

11. Bounded Context An operational definition of where a particular model is well-defined and applicable. (Typically a subsystem, or the work owned by a particular team). Define Bounded Context

19. Not all of a large system will be well designed.

20. SubdomainPart of the domain, based on a particular conceptual decomposition of the domain. Define Bounded Context

23. Not Just Core Features;Core Domain

24. DDD is a Set of Driving Principles Focus on the Core Domain. Explore models in a creative collaboration of domain practitioners and software practitioners. Speak a Ubiquitous Language within an explicitly Bounded Context.

25. Building Blocks Entities Value Objects Services Domain Events Aggregates Modules

26. Aggregates

27. Aggregate A cluster of run-time objects that are required to be consistent, whereas updates between aggregates may be asynchronous. Define Bounded Context

28. Service

29. Service A significant process or transformation in the domain modeled as a stand-alone operation. Define Bounded Context

30. Domain Events Something happened that domain experts care about.

31. Domain Event Something happened that domain experts care about. New information about activity in the domain modeled as a series of discrete events. Define Bounded Context

32. Safe or Out?

33. These are not the same: Subdomain– Decomposition of the domain. Module – Decomposition of the model and associated software. Aggregate – Decomposition of the run-time data. Service – Decomposition of functionality. Bounded Context – Linguistic boundary marking the applicability of distinct models.

34. Areas Of Innovation Event Sourcing, CQRS, <new name here> UdiDahan Greg Young Process Integration GojkoAdzic Eric Evans

35. DDD is a Set of Driving Principles Focus on the Core Domain. Iteratively explore models in a creative collaboration of domain practitioners and software practitioners. Speak a Ubiquitous Language within an explicitly Bounded Context.