This carefully selected vocabulary collection is the essential core of words that need to be known and correctly used by middle schoolers, ESL students, and other adults for whom English is a second language. It presents 42 brief but effective word-building lessons. Each lesson introduces twelve new words contained in sample sentences and short articles. Fill-in-the-blanks exercises help students gauge their word-building progress. Two new features in this edition are “100 Frequently Misspelled Words” and “125 More Difficult—But Essential Words.”