Standard Computer operations can be broken down in the following classes:
Alpha Class: Computer operations that include Secret or lower systems, such as access to Power Control Systems, Computer Control Systems, and Weapon Control Systems - Ship's Command Staff Only
Beta Class: Computer operations that include Restricted or lower systems, such as access to Maintenance Systems, Power Distribution Systems or Communication Systems - Regular users having passed security screening, aka. Starfleet Officers.
Gamma Class: Computer operations that include sensitive or lower systems, such as Public Transportation Systems, Public Information Systems or Public Nutrition and Environmental Control Systems - Visitors and other transient personnel
Level 1: Basic Operations: The privilege to use a turbolift, a replicator, a heating and ventilation system.
Level 2: Public Databases: The privilege to use a Public News Network and similar databases.
Level 3: Subspace Communications: The privilege to access the standard subspace module for communication outside the ship.
Level 4: Restricted
Databases and Lower system functions: The privilege
to access restricted databases, such as room distribution
and cargo availability charts. Also lower system
functions such as System Diagnostics up to level 3.
Level 5: Secret Databases and Higher System Functions: The privilege to access secret databases, such as personnel records and defense status charts. Also higher system functions such as System Diagnostics up to level 5, and authorization commands for use of systems such as weapons and power control.
All officers and Starfleet ambassadors have level 5 clearance, modified for their departments.
Level 6: Full
system functions: The privilege to access full
computer controlled systems and full diagnostics and
Level 7: Special system functions: On special authority, this level gives the privilege to monitor other communication within the ships connected systems, including the Secure Subspace Communication Modules. To gain this level of clearance, two different Level 6 users must together initiate the temporary clearance.