The United States uses a tier system to rate nations.
Severity was assessed using a tiered grading system, where grade 0 was 'absent' and grade 3 was "severe" according to pre-specified criteria.
GoActive is implemented using a tiered-leadership system where mentors (older adolescents within the school) and peer-leaders (within each class) encourage students to try these activities each week.
Mr. Lund said his organization had previously used a tiered-pricing system to make membership, swimming lessons and gym activities accessible to more families.
Using a three-tier system, the US state department ranks how countries are complying with the Trafficking Victims Protection Act.
Each slide was assigned a score for intensity and staining pattern using a 4-tier system.
Staining intensity was scored using a four-tier system as defined in Table 1.
The intensity of p44/42 MAP kinase reactivity was scored using a four-tier system as follows: 0, no staining; 1, weak; 2, moderate and 3, strong.
The intensity of phospho-Akt (Ser473) reactivity was scored using a four-tier system: 0, no staining; 1, weak; 2, moderate; and 3, strong.
Staining of MUC5B was scored semi-quantitatively using a four tier system: 0, undetectable (0% positive cells); 1+, focally positive (<10% positive cells); 2+, moderately positive (<50% positive cells), and 3+, intensely positive (more than 50% positive cells).
