administrator - An administrator of the school itself.  This is a school governance role, not a technical role.  For example, the principal or headmaster of a school is an administrator.  Compare with "manager."

class - We avoid using "class" as an educational term. It has too many overlapping usages. Plus it has a different meaning in computer science. If someone is using "class" in an educational context, they probably mean a "section."

period - A period represents a specific configuration of sections and venues in the school. That is, for any given period, you should be able to identify what sections should be meeting in what venues. Periods occur during one or more slots in the school timetable.

manager - A person who maintains an instance of SchoolTool.  This is a technical role, not a school governance role.  For example, a systems administrator or webmaster that is responsible for setting up SchoolTool and keeping it running is a manager.  Compare to "administrator."

schedule - This is used as a verb in the SchoolTool UI, to refer to the process of assigning a student to his or her sections.

school-administrator - Longer form of "administrator."  Useful for avoiding ambiguity with "site manager" role.

section - A section is a set of one or more learners who engage in some educational endeavor over a period of time. There are lots of other optional attributes and relationships associated with sections. They may have instructors, they may be implementations of courses, they may take place during terms. The standard example of a section would be something like "Mr. Hoffman's 9:00 Algebra II class, spring semester, 1995." Less traditional structures like eLearning and internships are still expressed as sections.

site-manager - Longer form of "manager."  Useful to avoid ambiguity with the "school administrator" role.

slot - Defines a period of time in a school timetable. Just the time and day in the cycle. 8:00 - 9:30 Monday mornings is an example of a slot. Or 8:30 - 9:30 on "B" days. Each slot contains one period.

term - A unit of time that defines the days school begins, ends and is in session during the course of a year. For example, a semester or trimester. The beginning and ending of a section typically corresponds to one or more terms. Students are generally recieve evaluations for each section at the end of the term.

time period - Synonymous with "term."  Deprecated.

timetable - a person's or section's timetable is the automatically generated set of scheduled classes for the person or section.  Generated from the timetable schema.

timetable schema - this is a "bell schedule" in US parlance, defining when section meetings (class periods) start and end.  In the case of rotating or modular schedules, which sections meet at various points in the cycle.