Aspects of the groundbreaking ergonomic model for keyboard fingering of isolated melodic fragments developed by R. Parncutt, J. A. Sloboda, E. F. Clarke, M. Raekallio, and P. Desain (1997) are reviewed, including the potentially problematic specification of finger spans in semitones. Modifications to some of the underlying rules are introduced in order to better reflect modern piano-pedagogical thought on finger strength and the playing of notes that are not spaced closely together on the keyboard. On the whole, the modified model had more pianists' fingering choices represented in its top predicted fingerings for opening fragments of Czerny studies than did the original model.

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