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I'm specifically referring to DIY.com here and I have not seen this type of navigation before (have you?)

My question(s) is(are) this: what are the reasons why www.DIY.com have hidden some of their sub-levels of Navigation behind "view alls" upon rollover of primary category eg. garden? What are the advantages and disadvantages of this UI? (ie. in this example, there are actually 6 sub-categories under "Sheds and Storage" but they've decided to only show 3. Why? Is there any research to support the advantages of this?

I can take a good guess as to why this is the case (reduce level of cognition, reduce choice, promote certain sub-categories). A clear disadvantage being summarised by Jared Spool.

Users can't predict the future, so they don't know they need to reveal the menu to get what they need. - Jared Spool

Here is a screenshot: enter image description here

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I would assume it is because it barely fits on screen as it is. If they were to show all categories in the nav then then the whole menu itself would be too big to fit on the screen. Jared's quote is less relevant here - It's not like it's one single 'menu' button; it's a 'View All' link underneath the Sheds & Storage category. I guess it could be slightly improved by renaming it 'View all Sheds & Storage' but the position of each 'View All' link already implies it's associated to the category headings. How would you design this menu to be better? They can't include everything in the menu. –  JonW Feb 12 at 9:44
Agreed, but don't you think there are other options and they've gone for this option for a reason. What is that reason? For example, they could have approached a link catch all approach? Or a more linear link approach? Or even just link the user through to the category and show the user the subs there? Do you not think this approach seems to be taken from a design POV (i.e. all sub-category containers on the mega menu are 4 line height)? What do you think? –  DLM Feb 12 at 10:32
We're just going to be making assumptions as to the reason for this. Unless someone from the B&Q web development team who was actually involved in the build is a member of this site and can answer exactly. –  JonW Feb 12 at 10:49
Indeed, that's the whole premise of the question. We're assuming X / Y / Z. My question is (or should be maybe I need to rephrase it) based around is there any research to suggest that this method of navigation is / was the best choice /most converting for the end user? –  DLM Feb 12 at 10:51
Amazon and other big sites have a similiar menu if I'm not mistaken. There is just limited screen space is what I think too. –  user39400 Feb 13 at 13:28

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