There are three main methods of grading a restaurant:
Letter grade (ABCDF) - This grading scale is similar to the one used in grade schools today. Points (as discussed above) are subtracted from the total possible, and a percentage is given. The resulting percentage falls onto a scale from A-C and sometimes also D and F. Grades A and B signify few or no violations while grades of C, D or F represent restaurants that have enough violations to be considered serious. These restaurants are often give citations, fined, or sometimes shut down.
Risk Index - This type of system is similar to the ABC but instead uses an arbitrary scale to rate the restaurant. Violation points are tallied and the restaurant will fall into categories ranging from Inadequate to Excellent.
Colored Tags - Green, yellow, red and white tags are used to show most recent inspection results. Green tags indicate little to no violations. Yellow shows some critical violations. Red shows that the restaurant suffers from numerous serious violations this tag usually means the restaurant is receiving fines or is soon to be shut down. White tags indicate probation after being closed due to previous violations.