Sustainable

Purpose: Balance long-term business capability needs with cost effective technology solutions. Solutions are manageable, maintainable, measurable.

Concept Make things maintainable, manageable and measurable. Enable measurement of system performance. Design for monitoring, logging, run-time tuning and diagnostics. Make decisions based on the full lifecycle of things. Design for extensibility. Make things testable. Document knowledge needed by others; an undocumented system is not maintainable.

Achieving this Guiding Principle

Best Practice

Applications and services are not designed with dependencies on deprecated components [1]; they may depend on contained components [2].

Applications and services log events and produce alerts needed to measure service levels and other metrics.

Business rules and other system behaviors are configurable via Web-based UIs.

Systems are auditable; all activities are logged.

New applications and services are built using established development frameworks.

Glossary:

[1] A Deprecated component is one that is (or will be) phased out from usage.

[2] A Contained component is no longer available for new usage.