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Understanding texts in Attempto Controlled English (ACE) is considered undemanding, nonetheless hides some problems. To deal with these problems I propose an experiment based on Kuhn's ontographs that tests the understanding of simple ACE texts. Furthermore, I suggest to compare the relation between authors and readers with human verbal conversations. My conclusion is that the correct understanding of an ACE text is possible, but requires contributions from both authors and readers, quasi their cooperation.