Factor deep dive · C
Factor C: whether a special staffing ratio is required
Factor C is the third of the four factors rated in each domain. It asks whether the IEP requires a reduced provider-to-student ratio — more staff per student than usual — for the student to access and participate, beyond what's typical for same-age peers.
The qualifier from the rubric: the ratio has to directly enable access and participation, not just provide general supervision. What counts is staffing the IEP requires so the student can access the instruction.
Two things to keep separate from the ratio itself:
- Ratio is not setting. A student in a self-contained classroom isn't automatically high on Factor C. The question is whether a reduced ratio is required, wherever the student is.
- Don't double-count across domains. If one reduced ratio is really there for, say, independent functioning, and behavior or curriculum benefit as a side effect, rate it only in the domain it's required for. Rate it in multiple domains only if it's genuinely required for FAPE in each. what is a domain
The four levels
The levels increase nearly the same way in all five domains:
| Level | What it means |
|---|---|
| 0 — None required | No reduced ratio needed for FAPE. |
| 1 — Minimum | Reduced ratio needed intermittently — certain blocks, tasks, or settings. Otherwise typical group sizes work; staff support is responsive. |
| 2 — Moderate | A planned reduced ratio during specific blocks/settings. Coverage must be intentional and reliable, though it may be shared across a few students. |
| 3 — Significant | A highly restrictive or near-continuous ratio (often effectively 1:1) across most of the day. Instruction/participation can't happen without it; the ratio may shape schedule or placement. |
Factor C in each domain
The structure barely changes by domain. What differs:
- Curriculum — for dyslexia instruction, Factor C keys off group size vs. the program's fidelity requirements: within fidelity size = Level 2; smaller than fidelity size = Level 3. how to rate a student
- Behavior — the reduced ratio is about preventing escalation and ensuring immediate response; Level 3 is near-continuous staffing for safety.
- Communication — Level 3 is often an effectively 1:1 communication partner across the day.
- Independent Functioning — Level 3 is a dedicated/near-constant presence to function across routines.
- Personal Care / Health — Level 3 is continuous supervision/assistance for safe attendance; ratio needs may dictate placement.
Factor C is not the same as Service Groups 4–5. Factor C is a 0–3 rating inside a domain; Service Groups 4–5 are a separate classification based on dedicated 1:1 time as a percentage of the day (or, by a second route, services delivered offsite). Where both involve 1:1 staffing they get conflated — but Factor C feeds the tier, and the service group is additive on top of it. service groups
How the other factors relate to C
The domain takes its highest factor. How scores become a tier covers how the domain scores combine.