Drafting Standards – What metric units do I draw with?

What metric units do I use in my architectural, structural, building services or civil disciple drafting projects? Is it millimetres (mm), centimetres (cm), metres (m) or kilometres (km). In AutoCAD do I draw my architectural plan in mm or cm? How about Civil plans is it m or km? What is the industry drafting standard? In this video tutorial I will show you what is used on a real project. *Alternate spelling: millimeters, centimeters, meters or kilometers