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Hi Freek, Here are my thoughts : 1 : Might look like a spammy keyword stuffed url to users and search engines 2 : Short and sweet, you do lose the idea of parent/child relation, but I think it's the most clean and optimized one (as long as you keep it short) 3 : Less descriptive, but looks less keyword optimized and might help to get breadcrumbs because of the parent/child relation. 4 : Not that I can think of, you might want to try both, number 2 and 3 on a certain part of your website, track your rankings and see wich ones goes up and wich ones stays the same or decrease. Then you should be able to decide wich one is the best. Also, don't forget to ask website's customer what they think would be the best URLs, their opinion also counts! Best regards, Guillaume Voyer.