L - Slab is broken into four or five pieces pre- dominantly defined by low-severity cracks.

M - Slab is broken into four or five pieces with over 15% of the cracks of medium severity (no high-severity cracks); slab is broken into six or more pieces with over 85% of the cracks of low severity.

H - At this level of severity, the slab is called shattered: (1) slab is broken into four or five pieces with some or all cracks of high severity; or (2) slab is broken into six or more pieces with over 15% of the cracks of medium or high severity.