Forum
Problem
Users want to discuss a certain topic or react on a particular piece of content on the site
Solution
Create a list of topics and allow users to place comments on the topic

From
www.esato.com/board
Use when
You are designing a
Community Site or other site for which you are interested in
Community Building. Many people can be tied into a site when there is ample opportunity to interact with the site. Such interaction with a site, or its content in particular can also be found on
News Site or on a
Article Page.
How
A forum is literally a discussions place. It is based on discussion topics and their comments. A forum starts with an overview page of all the running discussions. For each discussion it must be stated how many comments have been place, and when the last comment was placed. When a discussion is selected the discussion page shows the following elements: the topic/statement, functionality to add a comment, functionality to navigate between the comments and of course the comments themselves. Often there are also
Breadcrumbs so you can see which subcategory of discussions they are in and can easily jump back to other discussion. Each comment consists of a text-body and some optional attributes like "name", date and sequence number. When more and more comments are placed a
Paging mechanism is used to browse the opinions. The list of comments starts with the first comment that was added and goes on vertically with the successive comments.
When users regularly visit a forum they need to get a feeling of 'what is going on'. Which messages have been added lately, which discussion topics are new and who has posted which comment? In order to facilitate these goals, the following functionality is useful:
- Provide ways to show what is going on: 'new posts', or 'last 24 hours posts'.
- allow people to complete a Registration so that when they Login they can have their own nickname, avatar and so on. This allows users to personalize their own appearance and makes searching for specific articles easier.
- A forum must have an Advanced Search to find specific articles.
Why
A forum is one of the oldest know community elements. Putting all comments on one page makes it easier to read than, opposed to "threading" them.
More Examples
http://www.designmeltdown.com/chapters/Forums/ (presently 2 collections)