Below is how the Grader Tool handles potential errors.

2.1 User Interface Overview

• TA Interface Overview (2.1.2.1)
• input invalid or no user name and/or password "Not a valid username or password"
• Student Interface Overview (2.1.3.1)
• input invalid or no user name and/or password "Not a valid username or password"

• Add/Modify student (2.3.2/2.3.3)
• input no Student ID error "Input a student ID"
• input duplicate Student ID error "Input a unique student ID ( conflicts with )"
• Delete student (2.3.4)
• if no student selected error "Select a student to delete."

• Managing Categories (2.4.1.3)
• Invalid or no category name "Invalid category name"
• Duplicate category name "Input a unique category name"
• Adding Graded Items (2.4.2.4)
• Invalid or no graded item name "Invalid graded item name"
• Duplicate graded item name "Input a unique graded item name"
• Adding Graded Items (2.4.2.6)
• Invalid points/percentage value "Input a valid point or percentage value"
• Adding Graded Items (2.4.2.7)
• Invalid extra credit points/percentage value "Input a valid point or percentage value"
• Extra credit points/percentage value less than original point/percentage value "Input an extra credit value greater than the total points/percentage possible"
• Adding Graded Items (2.4.2.8)
• Invalid grace period amount "Input a valid grace period value"
• Adding Graded Items (2.4.2.9)
• Invalid decay settings points/percentage value "Input a valid point or percentage value"
• Modifying Graded Items (2.4.3)
• Since the modify graded item view is identical to the add graded items view, all error messages are the same as section 2.4.2

• Entering Grades (2.5.4)
• Invalid value, greater than total possible for Graded Item or if extra credit is allowed, greater than the total extra credit score. "Score cannot exceed maximum score of (Max Score)"

• Grade Curve Set 3/8ths Curve (2.6.3.1)
• input invalid percent error "Insert a valid percentage 0-100%"
• Grade Curve Set Find Gaps (2.6.3.2)
• input invalid percent range "Insert a valid percentage 0-100%"
• Grade Curve Insert Percentage (2.6.3.3)
• input invalid percent error "Insert a valid percentage 0-100%"
• input invalid grade error "Insert a valid percentage--Must be lower than higher letter grade percentage and higher than lower grade percentage"

• Export (2.7.1.1)
• selecting Posting Grades when a server hasn't been setup yet "Server is not setup yet"
• Server Setup (2.7.1.1.1)
• input invalid or no class name and/or server url "Not a valid class name or server url"
• Predicting Grades (2.7.3.1)
• input invalid value "Not a valid number"
• Manage TA (2.7.4.3)
• input invalid or no first and/or last name "Not a valid first name or last name"