Behavioral and Brain Sciences

Open Peer Commentary
Halford et al.: Relational complexity

To appraise developmental difficulty or mental demand, relational complexity is not enough

Juan Pascual-Leone a1
a1 Department of Psychology, York University, Toronto, Ontario M3J 1P3, Canada [email protected]


Two assertions of Halford et al. are critiqued: their claim of priority in relational complexity analysis and the sufficiency for cognitive development of their relational-complexity analysis of tasks. Critical discussion of concrete task analyses (i.e., the relational complexity of proportionality problems, of balance scale problems, and the Tower of Hanoi) serves, by way of counterexamples, to highlight problems in their method.