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| Minimum levels of supervision | ||||
| Perimeter Considerations | Grade 1 | Grade 2 | Grade 3 | Grade 4 |
| Doors | O | OP | OP | OP |
| Windows | O | OP | OP | |
| Other opening sections | O | OP | OP | |
| Walls | p | |||
| Ceiling/Roofs | p | |||
| Floors | p | |||
| Room | T | T | T | T |
| High risk objects | S | S | ||
| Key to chart: O = opening, p = Penetration, T = trap, S = object requiring special consideration | ||||