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Face to face with China / Harold B. Rattenbury. London: George G. Harrap & Co., 1945
“The Isotype system was much more than a dictionary of visual symbols which could be selected and arrayed in lines to show, for instance, the difference between one commodity and another over a period of time. A key part of the Neurath's Isotype method was his precise method of assembling icons into statistical charts. While Neurath knew the value of pictures as a way to get people interested in what he was teaching them, he was also aware of the charting pitfalls that went with pictures. He used the term 'statistical accountability' to describe his approach. He and Arntz designed icons that could be used next to one another in rows, could stand for quantities and thus be 'accountable'.”
Nigel Holmes. “Pictograms: a view from the drawing board or, what I have learned from Otto Neurath and Gerd Arnts (and jazz).” Information design journal, vol. 10, nº 2, 2000/01 (p. 137)