A word-based vocabulary design that is available for SD Pro. WordPower combines the features of core vocabulary, spelling, and word prediction. The system capitalizes on the fact that a core of just 100 words accounts for approximately 50% of most words spoken. There are four components of WordPower: WordPower (for text users), Picture WordPower (for users who need picture cues), Scanning Word Power, and Scanning Picture WordPower. The Picture WordPower uses PCS.