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by elclanrs 4505 days ago
I find this paper [1] very interesting and elaborates on this issue -- "From experience it appears that there are three major semantic hurdles which trip up novice imperative programmers. In order they are: assignment and sequence, recursion/iteration and concurrency".

[1] http://www.eis.mdx.ac.uk/research/PhDArea/saeed/paper1.pdf