== Usage Model ==
 * Log in
 * Log out

 * add a photo
 * view a photo
 * tag a photo
 * caption a photo
 * remove a photo
 * share a photo

 * create an album
 * name an album
 * view photos in an album
 * add photo to an album
 * remove photo from an album
 * share an album

 * subscribe to a photo feed
 * view a photo feed
 * view an aggregation of photo feeds
 * unsubscribe from a photo feeds

 * comment on a photo
 * view a comment
 * remove a comment

 * browse photos
  * by album
  * by photo feed
  * by tag
  * by location
  * by date taken

 * search for a photo
  * by caption
  * by tag
  * by date taken
  * by location
  * by comments
 * search for an album
  * by name

== Domain Model ==
[[Image(domain_model.png)]]


== User Interface Model ==

=== Task Hierarchy ===
Task hierarchy of existing photo sharing systems from a [wiki:PhotoSharingResearch previous study] into existing photo sharing systems:

[[Image(wiki:TaskHierarchy:task_hierarchy.png, 800px)]].

== References ==
See PhotoSharingResearch for a user-centered study into photo sharing.

 * [http://www.agilemodeling.com/essays/initialRequirementsModeling.htm Initial requirements modeling]
  * [http://www.agilemodeling.com/artifacts/essentialUseCase.htm Essential use cases] / [http://www.agilemodeling.com/artifacts/userStory.htm User stories]
  * [http://www.agiledata.org/essays/agileDataModeling.html#InitialDomainModel Initial domain model]
  * [http://www.agilemodeling.com/artifacts/essentialUI.htm Essential UI prototypes] / [http://foruse.com/articles/abstract.htm Abstract prototypes]
  * [http://www.agilemodeling.com/artifacts/uiFlowDiagram.htm UI flow diagrams]
  * [http://www.agilemodeling.com/artifacts/uiPrototype.htm UI prototypes]