introducedimplemented

Introducedimplemented is a neologism used in software development to describe a two-phase approach to feature work, in which a feature is first introduced at the planning and design level and subsequently implemented in code. The term combines introduced and implemented to highlight the separation between specification and execution.

In practice, the introduced phase focuses on defining the feature’s scope through interfaces, contracts, and user or system requirements. This can include API definitions, data models, UX prototypes, workflows, and documentation. The implemented phase follows with actual coding, testing, integration, and deployment, often guided by the previously established contracts and designs. Teams may organize these phases across separate milestones or sprints to ensure alignment before full implementation begins.

Benefits of this approach include clearer requirements, earlier validation of feasibility, and reduced rework when implementation milestones are delayed or adjusted. It can also support contract-first development, improve interoperability, and enable staged or feature-flagged rollouts that minimize risk.

Challenges include potential drift between design and implementation if contracts are not maintained, added management overhead, and the need for rigorous versioning and change control. The success of introducedimplemented depends on strong governance around interfaces, timely communication with stakeholders, and disciplined update of specifications as needs evolve.

See also: design by contract, API design, feature flag, progressive delivery, phased development.