Multiuser Bibliography User Segments

This is a brief overview of user segments I've defined for my multiuser bibliography application, based on the discussion in chapter three of Garrett's The Elements of User Experience. (I determined these speculatively, not through empirical research.) This text was originally posted to the Angel site for WRA 410, in the "Module 2 project descriptions" discussion, 2008-02-08.

User segments for this application:

Browsers
Casual users who want to look at a single entry or a handful of entries. May have found the site by searching, so don't assume any prior knowledge of the site for this segment. Anonymous read-only access. Tasks: searching the database by various criteria, view summary of all or matching entries (browse), view an entry's details, export entry (when export functionality is available).
Contributors
Regular users who are allowed to add to the database. Will have accounts, so some basic training can be provided along with account information. Tasks: everything for browsers, plus log in, add entry, comment on an entry, edit own entry / comment, submit bug report. Possible future functionality is to create lists of entries, operate on lists (eg export everything in list), and save lists for subsequent visits.
Administrators
Special users who can perform administrative functions. Will have accounts; extensive site knowledge assumed. Tasks: everything for contributors, plus create bibliography, edit any entry, add / edit / remove users, read / update bug reports.

(Ideally, even anonymous "browsers" could submit bug reports. But because unprotected message-submission forms are vulnerable to blog-spamming, this isn't practical without some other protection mechanism such as CAPTCHAs, and they bring all sorts of new problems — plus they have an abominally dumb name. So no bug submissions or other input from anonymous users in the alpha release.)