I don't know if anyone has heard of this before but I heard of it from a professor who teaches english students. Lucidity + Elegance + Individuality = Permanence. I will try to explain it to the best of my knowledge. The example he gave me for lucidity was "Mother died today. Or perhaps it was yesterday, I don’t know." - The Stranger by Albert Camus. That is the first line of the novel he Albert Camus wrote. The professor chose this because the message is very clear and easy to understand. If everything you wrote was lucid you would most likely capture the readers attention. Edit: I don't know what elegance is then. The last one is Individuality. It is pretty self explanatory but it is probably the hardest one to master. If you think about it, most stories these days have a recycled plot with changes of setting and characters (even the characters might be similar in personality). And what does this all mean? By permanence he basically means shelf life of a story you get published. Anyways take care and write on!