Righting Software

Variability, on the other hand, describes those aspects that you can easily handle in your code using conditional logic.

Reduce Uncertainty

For an Engine to change, your business must change the way it is performing some activity, which is more uncommon than changing the sequencing of activities.

implicit. It is vital to invest the time in both verifying the explicit constraints and discovering the implicit constraints. Designing a system and project that violates a constraint is a recipe for failure. From my experience, a software project should spend roughly between 15% and 25% of the entire duration of the project in the front end, depen

someone must combine these discrete functionalities into a required behavior. That someone is often the client. When the client is the one orchestrating the services, the system becomes a flat two-tier system:

components and how these components should interact. The result is the architecture of the system.

A loosely coupled system design such as that in Figure 7-1 has minimized the number of interactions to the point that removing one interaction makes the system inoperable.

benefits of architecture (maintainability, extensibility, and reusability) are down-the-road benefits.

ResourceAccess Reuse