The following matters must be taken into account in negotiations concerning a designated work group or groups (including negotiations for a variation of an agreement) under this Division—
(a) the number of employees at the workplace or workplaces;
(b) the nature of each type of work performed at the workplace or workplaces;
(c) the number and grouping of employees who perform the same or similar types of work or who work under the same or similar arrangements;
(d) the areas at the workplace or workplaces where each type of work is performed;
(e) the nature of any hazards at the workplace or workplaces;
(f) any overtime or shift working arrangements at the workplace or workplaces;
(g) whether other languages are spoken by the employees.