I am cautious about the word "development". It implies that adult numeracy competence might be placed on a continuum - something I am not particularly sanguine about. However, I will leave it for the meantime.
Hoogland in this paper elaborates on a model of Adult numeracy development taken from Maguire and O'Donoghue (2002). Here the model tries relate learning to domains of increasingly rich contexts. It refers to formative, mathematical and integrative phases. I am not sure that the second of these is an entirely useful description. Perhaps another word could replace "mathematical"?
