The assignments highlighted in red indicate that a serious problem has been detected which the user should investigate. Orange indicates less severe problems. Green highlighting indicate good assignments, generally where a staff member has been assigned a shift that they have specifically requested.
Detailed information about any problems can be viewed at the bottom of the screen by clicking on the assignment of interest above.
The information bar on the right hand side is not shown in this screenshot.
Note the padlocks shown in the top right hand corners of cells indicates that some assignments have been locked so that the software won't try to make changes when it is optimising the roster.