Strategies and flexibility in mental calculation

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Flexible and adaptive use of strategies and representations in mathematics education (2009, methodology): “The first part of this issue dealing with adaptive use of strategies starts with an article by Threlfall (2009) that discusses the predominant strategy choice model, which is explicitly or implicitly used by many researchers in the field.”
Teaching and Learning About Whole Numbers in Primary School (2016, methodology): “Based on various definitions, Threlfall (2009) identified two different explanatory models for flexibility in mental calculation: one based on the idea of conscious or unconscious strategic choice and one based on the idea of “zeroing in” on a solution based on number knowledge and conceptual…”