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Designing Blueriq applications top down means that at first, (amongst others) cases and registrations are identified. Both a registration as well as a case can be seen as an aggregate, so designing aggregates is easy: for each identified case and each identified registration, an aggregate can be declared. In some situations, registrations are not native, so a web service might suit better than an aggregate. The final step, designing the domain is also not that difficult: we just have to fill up the aggregates, which means deciding which entities are part of which aggregate.
See the right side of the diagram above to illustrate the top down design.

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Bottom up design

Designing an application bottom up starts with meticulously designing the domain, with all its entities and relations. When designing aggregates, some relations need to be excluded from the aggregate design, otherwise the aggregates contain too much data. After designing the aggregates, a separate design has to be made which contains the intended application. See the left side of the diagram above to illustrate the top down design.

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