[itsm] Queue and SLA

Hi all   i found similar options at Queue and SLA,  may i know what is the different.         Escalation - First Response Time: (0 = no escalation - 24 hours = 1440 minutes - Only business hours are counted.) minutes ( Notify by - 10% 20% 30% 40% 50% 60% 70% 80% 90% ) Escalation - Update Time: (0 = no escalation - 24 hours = 1440 minutes - Only business hours are counted.) minutes ( Notify by - 10% 20% 30% 40% 50% 60% 70% 80% 90% ) Escalation - Solution Time: (0 = no escalation - 24 hours = 1440 minutes - Only business hours are counted.) minutes ( Notify by - 10% 20% 30% 40% 50% 60% 70% 80% 90% )