Lifetime Spelling contains the 5,500 most common words arranged by difficulty from the 100 simplest words to on Level 1 to the 100 most difficult words on the last Level. Students and adults who master Lifetime Spelling will be able to spell more than 98% of all words used in written discourse. A Handbook explaining how to use mastery tests to proceed from one Level to the next , tips for studying spelling, etc. is included at no additional cost. Price schedule is for entire school.