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Graduate Defense: Brody Downs

July 6 @ 1:30 pm - 2:30 pm MDT

Thesis Information

Title: Improving Spellchecking for Children: Correction and Design

Program: Master of Science in Computer Science

Advisor: Dr. Jerry Fails, Computer Science

Committee: Dr. Casey Kennington, Computer Science, Dr. Maria Soledad Pera, Computer Science, Dr. Katherine Wright, Literacy, Language, and Culture

Abstract

Children commonly use software applications such as search engines and word processors in the classroom environment. However, a major barrier to using these programs successfully is the ability of children to type and spell effectively. While many programs make use of spellcheckers to provide spelling corrections to their users, they are designed for more traditional users (i.e., adults) and have proven inadequate for children. The aims of this work is twofold: to address the types of spelling errors children make in order to understand how to better correct children’s spelling and the design of an interactive spellchecker to better understand how to accommodate children in the spellchecking process.

Motivated by children’s phonological strategies to spell, a phonetic encoding strategy is used to map words and misspellings to phonetic keys to effectively and efficiently provide spelling correction candidates. Machine learning methods, including Learning to Rank, are used to rank candidates effectively and reveal the importance of phonetic features. Experimental results show this method is able to more accurately provide and rank spelling corrections when handling misspellings generated by children in both essay writing and web search settings when compared to state-of-the-art baselines. The design of an interactive spellchecker reveals children’s propensity towards visual and audio cues. A study on visual and audio cues show an influence on children’s selection habits and a positive impact on assisting children in selecting correct spelling suggestions.