Derailleur gears operates the lever while pedalling, the change in cable tension moves the chain-guide from side to side, "derailing" the chain onto different sprockets. For more information about the choice of particular gear ratios and sprocket sizes, see Bicycle gearing. "Derailleur" is a French word, spelled "dérailleur" in French, derived from the derailment of a train from its tracks. Its first recorded use was 1930. At least one notable bicycle industry author has attempted to promote the anglicized spelling of "derailer". As of 2013, however, neither Merriam-Webster nor the Oxford English Dictionary has an entry for "derailer". Various derailleur systems were
Word sort have a responsibility to students they serve to identify their needs and implement instructional strategies to scaffold students’ understandings of sounds. Intervention strategies may be necessary in remediating students who cannot correctly identify sounds in isolation on a given opportunity. Programs like Reading Recovery have contemporary phonemic techniques embedded in the program. Also, books and poems may specifically focus on word families and similar sound patterns for children to identify and understand in context. Sound sorts can be integrated through programs, or very inexpensively through teacher-created materials. For example, students can sort pictures by beginning sound, rhyme, or ending sound.