AI didn't add a phase to the development cycle. It broke the balance between them.
The SDLC was designed for humans. AI entered as an accelerator, not a redesign. Development exploded. Testing, validation, deploy, monitoring stayed roughly the same. The imbalance generates entropy that compounds with every cycle.
The symbiotic SDLC
Six phases. AI changed them unevenly. 41% of code is now AI-generated, but delivery throughput hasn't improved. A gap opens between what the system becomes and what humans understand about it. Each gap generates entropy. Each gap is where a product operates.
75% of developers use AI. Companies see no measurable performance gains. Developers write more code, but organizations don't deliver faster. The gap between production speed and delivery capacity is where entropy accumulates. Each cycle, the gap widens.
Formal models
The gap per phase can be modeled. Two functions describe how systems enter cognitive failure and how entropy compounds across phase boundaries.
- R
- Revision before action. Measured by review frequency and cycle stability.
- C
- Shared understanding. Decreases when code outgrows documentation.
- U
- Pressure to act without analysis. Grows with deadlines and crises.
- Ch
- Disorganization. Technical (bugs, rework) or human (noise, conflicts).
- D
- Dependencies between components, teams, and SDLC phases.
- R
- Unvalidated assumptions that accumulate silently across phases.
- C
- Information that doesn't reach the people who need it.
Entropy from interdependence and noise, not from lack of structure.
Why products compose
Each product covers one phase of the SDLC. When two cover neighboring phases, what each observes gains context from the other. Combined value is not additive. It multiplies.
Each agent is designed in isolation with defined inputs and outputs. The composition protocol makes them interoperable. The architecture follows the structure of the SDLC itself.
Where this goes next
Rigel Rise is the technical foundation. From here, two paths: see how these forces accumulate into business cost, or apply the ideas to validate delivery in your own cycle.