Factor deep dive · C
Factor C: whether a special staffing ratio is required
Factor C is the third of the four questions per domain. Factor C asks: does the IEP require a reduced provider-to-student ratio — more staff per student than usual — for this student to access and participate, beyond what's typical for same-age peers? The key qualifier, straight from the rubric: the ratio has to directly enable access and participation, not just provide general supervision. A staff member who happens to be nearby isn't a Factor C ratio; a staff member required so the student can access the instruction is.
Two cautions before the levels:
- 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/curriculum benefit as a side effect, only rate it 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
This factor uses nearly the same gradient 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. |
The gradient: occasional (1), planned-for-specific-times (2), near-constant (3).
Domain-specific notes
The structure barely changes by domain, so here are only the wrinkles worth knowing:
- 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 vs. Service Groups 4–5. Factor C (a 0–3 rating inside a domain) is not the same as Service Groups 4–5 (a separate classification based on dedicated 1:1 time as a % of the day). They both involve "1:1," which is why people conflate them — but one feeds the tier and the other is an additive service group. service groups
How Factor C fits with A, B, and D
Highest factor wins for the domain. how scores become a tier