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I'm asking not about professional software like IDE's, but about OS GUI and web interfaces.

A few years ago there was File manager in Windows, Gopher and other interfaces and data models like this.

Example of Windows File Manager
file manager in Windows

Example of Gopher.
Gopher

Now we rarely can see tree views in operation systems and applications, but we usually see tags, keywords or just one level of some tree structure.

Why tree views became unpopular?

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Perhaps it's because tags generalize hierarchies? –  redtuna May 31 '13 at 1:42
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I don't believe they are unpopular. What makes you think they are? I have Windows 7 in front of me now and that still uses tree views. I use Axure for wireframing - that also displays content pages in a tree view. Photoshop displays its layers in tree-views... Seems to me tree views haven't gone anywhere. –  JonW May 31 '13 at 8:54
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6 Answers

My take is that the most valuable thing a tree does is this:

  • Current thing
    • Details of current thing
    • More details
    • More details...
  • Another unrelated thing
    • Its details
    • Amazing details
    • More details

That is, it lets you see the detail of several different things at once.

IMHO - this is not a very useful attribute. Most of the time, you get better UX by only showing the single most relevant view, which is why the modern replacement of a tree view looks more like this:

  • Current thing
    • Details of current thing

< go back

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The problem is, that this only works if the tree does not have more than a few nodes per branch, and they are not too deeply nested. Otherwise, the view you present is going to be obscured by lots of - potentially irrelevent - data. Also, the details end up in lists under each other. That makes for a harder comparison than next to each other. So, IMHO, the tree doesn't work all that well for the usecase you describe. –  André Jun 5 '13 at 6:01
    
My point is that trees are useful in a limited range of circumstances. (I can't tell if you're agreeing with that or not.) –  Steve Bennett Jun 5 '13 at 6:07
    
I agree with that statement, but I disagree that the feature of being able to see several things at once is one of them in the general use case. –  André Jun 5 '13 at 10:24
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I agree with others here in that search and tags have replaced hierarchical conceptual models in many cases because they have real advantages both on the content creation side and the content consumption side.

But I must point out that tree hierarchies are hardly obsolete as conceptual models that are surfaced in UIs. Often it is the right conceptual model (e.g. underlying file/directory systems). While a label categorizing system as in gmail is more flexible than a hierarchical categorizing system, in some ways the more concreteness of a folder hierarchy is easier to understand.

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Perception: A new market for low complexity ("entertainy") applications has developed - explosively. Thus, even with non-diminishing tree use, it diminishes in percentage and plays less of a role in discusison of "modern" UI and UX changes.

Alternatives: One feature of a hierarchy - fast locatability - has been largely replaced by instant search. We now have the computational and algorithmic power to implement it, and a certain large search provider training a huge user base in using this efficiently, even if this may be less efficient thant a well-designed and well-understood taxonomy.

Another alternative that has become popular (because it is sufficient in many cases when navigation is fast) is a breadcrumb-style hierarchy indicator.

Fluid ubiquitous data: A taxonomy requires maintenance and familiarity. Recent technology has made more data accessible, and gives access to faster-changing (e.g. user created) data.

A taxonomy of a tree requires a (sub-) central authority of definition and - when data changes - maintenance. Search does away with that cost.

On the other side, many long-running taxonomies suffer from "initial skew" [citation needed], they fit the original data very well, but might be more efficient when rebuilt for current data. However, that would kill familiarity with the taxonomy, harming users.

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rarely? I see them all the time.
Half the windows I have open right now contain tree views, and half the other half are either console windows or this web browser loaded with SE.
Tree views can be very useful, depending on context. It's just that ever more people seem to think they're "outdated" and try to find twisted ways to do things differently for no other purpose than to be seen doing things differently.
Of course there are places where tree views were used (and sometimes are used) inappropriately, but the same is true for everything.

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There are several problems with trees:

  1. A tree is a single taxonomy. This requires the user's mental model to match the software developer's mental model of the domain.
  2. Navigating with trees requires high-precision mouse accuracy to expand a tree without selecting the branch. This is also very difficult to manage with touch interfaces.
  3. Navigating trees usually requires repeated interaction/clicking to traverse from the root to the desired leaf.
  4. Viewing the details of a leaf often obscures the broader context of the taxonomy and other interesting branches and leafs. This is the reason many multi-pane file explorers are created.

That being said, there are still many useful applications of trees. I think at one time, trees were "overused" and now there is a little more balance to the application of that pattern.

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People don't generally use hierarchical structures 'in the real world' -- it seems to be something that has been forced upon them, a technical remnant of the past.

What needs to be understood is the way that people recognise and organise things. Our brains don't work in a hierarchical way (without generating a lot of heat). Instead, we recognise things by similarity -- similarity of appearance, smell, taste, touch, etc. We see an apple, and we know it's an apple straight away. We don't have to think about it -- in a sense, it's a one dimensional way of thinking.

Since we recognise by similarity, it seems appropriate we should organise by similarity, too. This is something that hierarchical structure cannot achieve. Two documents may be very similar, but may differ by 3-4 branches on your tree. In the hierarchical world, these documents would be very distant. It is also difficult to define a canonical hierarchical structure -- a single document may be adequately described by two or more paths on your tree.

So it seems a more appropriate way is to 'cluster' documents. Rather than selecting documents to fit in some rigid structure, you create a fuzzy structure to fit your documents. You may create some descriptors (tags) for each document and use these as the basis of organisation.

The great benefit of tags is that they are relatively future proof. Trees work by assuming you know how you are going to query the documents in the future. For the Dewey system, this is fine because we are still querying books, in the same way, to find their bookshelf location. But, for digital documents, it may be more difficult to predict how we will query them in the future. By creating some semantic description of the document, it doesn't matter how we are querying in the future since the structure exists to explain the document, rather than simply locate it.

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+2 (but alas SE won't let me) for getting into the "functional" reasons of why trees don't mesh well with us people. –  Marjan Venema May 30 '13 at 19:56
    
+ Characterization is often more appropriate than classifying and allows structure to emerge around the artifacts instead of squeezing artifacts into a structure. –  JustinC May 30 '13 at 21:16
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+1 and like the Dewey decimal system, over time you see just how badly they match the current culture. Consider for example that languages like Mandarin are simply in "other languages", and the massive focus on Christianity. –  l0b0 May 31 '13 at 13:56
    
There's also weird quirks like computer science/programming being assigned 00x (under the 0xx "general works" category) instead of under the 6xx (technology) category where one might expect to find it. –  dan04 Jun 1 '13 at 5:37
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+1 for "without generating a lot of heat" and "the structure exists to explain the document, rather than simply locate it". Very wise and funny answer. –  Pol Jun 8 '13 at 10:13
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