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The three aspects of pronumerals (generalised numbers, variables and unknowns) were taught simultaneously using real contexts to associate meaning with the pronumeral involved.
a worded description, a symbolic equation with pronumerals representing the variables, a table of values, and a graph).
The third is a little closer to home: Chris Linsell, Michael Cavanagh and Salma Tahir in their paper Using meaningful contexts to promote understanding of pronumerals, outline the positive impact of using of meaningful contexts for teaching algebra with junior secondary students' in New Zealand and Australia.