| ITD | Impact Test Device [G] |
| ITDC | Impact Test Device Coefficient [G] |
| GSS | Shear from Going Stick [Nm] |
| GSP | Penetration from Going Stick [N] |
| OBST | Orono Biomechanical Surface Tester |
| RPS | Rotational Peak Shear [Nm] |
| VMC % | Volumetric Moisture Content |
| FO | First Order |
| TWI | Two-way-interaction |
| PQ | Quadratic Term |
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