While selecting Group/Owner for the task, you have the option of either marking (or) assigning the task to the technician.
Marking Task(s) is a way of associating tasks to technicians that helps administrator plan tasks in a better way
Marking Task(s) is an administrator activity that the technician never gets to know until the task is assigned to him/her
Marking Task(s) helps administrators to allocate 'marked tasks' to technicians 'only when it is time' for the task to be executed and not unnecessarily in advance
Marking Task(s) is especially useful for dependent tasks that heavily depend upon the completion of the parent task. Under such circumstance, the child task can be marked with a technician and can be later assigned to him/her based on the real-time completion of the parent task
Marked tasks do not appear in the respective technician�s My Tasks list (but only serve as a reference for the administrator) until the task is triggered.
Whereas Assigning Tasks to technicians will directly intimate the concerned technician about the task assigned (through notification) and will be listed on his/her My Tasks list.
Marking a Task
To mark a task to technician/group, do the following:
Select Mark using the toggle button.
* asterisk icon will appear beside Group/Owner fields indicating task form is in marking Group/Technician mode.
Choose Group & Technician to be marked with the task
Save the task

Assigning a Task
To assign a task to a technician/group, do the following:
Select Assign using the toggle button.
Choose Group & Technician to be assigned with the task
Save the task
