BBY/ABY is used to position items along the Star Wars Timeline. BBY refers to Before the Battle of Yavin. ABY refers to After the Battle of Yavin. The Battle of Yavin in Episode IV: A New Hope occured in 0 BBY/ABY.
The Youtini Expanded Universe Ranking system is a 1-5 scale that ranks EU book quality, difficulty, and importance. Books closer to Level 1 are easier to read and understand, more important, and of higher quality.
Han has left to get himself into more trouble, leaving Chewie all alone with the perplexing new problem that is a major pain in his hide! The iconic Wookiee will have to use all of his strength, wits, and patience to overcome this latest danger!