High grade Aa2 AA AA Aa3 AA− AA− A1 A+ A1 A+ F1 Upper medium grade A2 A A A3 P2 A− A2 A− F2 Baa1 BBB+ BBB+ 2 Lower medium grade Baa2 P3 BBB A3 BBB F3 Baa3 BBB− BBB− Ba1 Not prime BB+ B BB+ B 3 Noninvestment grade speculative Noninvestment grade AKA highyield bonds AKA junk bonds Ba2 BB BB Ba3 BB− BB ...A3 problem solving is a structured problemsolving and continuousimprovement approach, first employed at Toyota and typically used by lean manufacturing practitioners. It provides a simple and strict procedure that guides problem solving by workers. The approach typically uses a single sheet of ISO A3size paper, which is the source of its name.. See also
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