00 · Evidence

How Nexin works: the Requirements System

Nexin's core innovation is a Requirements System that converts tacit clinical knowledge into rulesets the platform can score against. Five service-quality states. One scored rota. A measurable change-set.

What every service is scored against

Each service in a Directorate has a Requirements Ruleset, what mix of staff is needed at each staffing level. The five states are:

The hierarchy maps to clinical priorities: Safety first, then Quality, then Efficiency. 232 of 233 doctors surveyed agreed (99.6%).

What Nexin does with that

• Score, any allocation of staff to services returns a Service Quality score.
• Optimise, Allocation algorithms (Simulated Annealing / GRASP) move staff into the configuration that maximises Service Quality across all services for the day, weighted by the Directorate’s Priorities. A 21-doctor / 11-service Directorate solves in under 500 ms on standard server hardware.
• Swap, Smart Swapping evaluates every candidate swap by re-running the optimiser and ranks the least-disruptive options.
• Forecast, Novel Rota Generation (in development) plans staffing further out by smoothing shift patterns within Working Time rules.

What Nexin doesn’t do (yet)

Novel Rota Generation is well-defined but not yet built. Machine Learning is on the roadmap once we have a corpus of scored rotas, not in the MVP.

Freedom to operate

Confirmed by Alasdair Poore, Mills & Reeve LLP, with Espacenet searches.

Last reviewed: 2026-05-06