Well in normal English, 'or' is generally exclusive. The cat is black or red. (Generally understood that he is one or the other, not both.) So, to me, 'and/or'

Well in normal English, 'or' is generally exclusive. The cat is black or red. (Generally understood that he is one or the other, not both.) So, to me, 'and/or' is the English equivalent of the inclusive OR. The cat is black and/or red. (The cat may be black or red or both.) Pretty sure this was discussed here a while back. (English boolean operators versus the programming kind.) English Logic and AND or XOR and/or OR So yeah, I'd agree with you in that I think the author's banning of 'and/or' is wrong. Honestly the only ones that I agreed with were 6, 7, 8, and 10. I've never even heard people use several of the others. One thing I hate is my current employer's culture of referring to people as 'resources'. I am not a lump of coal or a gallon of oil thank you very much. It took me quite a while to figure out that 'allocating resources' was a euphemism for 'reorganizing', which is itself a euphemism for 'firing some dead weight'.