Maintenance:
A Maintenance ID, found in People > Maintenance, can have wages, crafts, and skills assigned to their record. Having a craft and wage allows a Maintenance ID to have Estimated or Actual Labor placed on a Work Order under their name. A Maintenance person has the ability to receive access to anything in MVP depending on their assigned role.

Requestors:
A Requestor ID, found in People > Requestors, have limited access. A Requestor ID on user set up is only able to request work or purchasing records, Work Requests or Work Orders, or Purchase Requests. Depending on how you'd like to restrict them, your Requestor Users can do only one, some, or all of these things. Requestor Users do not have access to Reports.

Contactors:
A Contractor ID, found in People > Contractors, can have wages, crafts, and skills assigned to their record. Having a craft and wage allows a Contractor ID to have Estimated or Actual Labor placed on a Work Order under their name. A Contractor ID has the ability to receive all access via Roles during the user creation process.

Customers:
A Customer ID, found in People > Customers, have limited access. A Customer ID on user set up is only able to request work or purchasing records, Work Requests or Work Orders, or Purchase Requests. 

TPM:
TPM stands for Total Productive Maintenance. The concept of TPM is to adopt a comprehensive approach to equipment maintenance with the goal of achieving optimal production. TPM empowers operators to take an active role in equipment maintenance, by giving them the ability to perform and track their own maintenance work. 

A TPM User is only able to view Work Requests and perform certain actions on Work Orders. TPM Users do not have access to Reports. Please see the TPM User Overview article for more information.