Getting a system to work is only the start

Beyond the demo

A demo follows a controlled path: the input is known, the data is available and someone can intervene if anything fails. In operational use, the system encounters delays, exceptions, new questions and usage patterns that were not anticipated in the prototype.

Integration therefore belongs in the design. It determines how information enters the system, where results go and what happens when the system cannot provide an answer.

Design the integration points

The model and the interface are often the most visible components. Keeping the system running depends on how the components connect: identifiable data sources, traceable transformations, evaluation criteria and people with the responsibility and ability to intervene.

A coherent architecture makes these relationships visible. It need not anticipate every possible case. It should make the flow through the system clear enough to locate a problem, understand it and correct it without taking the whole system apart.

Improve without starting over

A useful system evolves with its context. It takes in new data, incorporates knowledge and adapts its components. To support that evolution, each version must be comparable with the previous one, and each change needs an explicit, verifiable rationale.

Building includes preparing for that evolution, so the system and the way it is used can improve through operational experience.