What are the 7 types of waste that can affect the productivity of a manufacturing process?

a. Overpopulation – This waste is overpopulation of production greater than what is required. Overpopulation can cost money by investing in inventory that is not needed. It can also create negative case flow.
b. Idle Time – This waste is a sum of all time wasted while the operator watch a machine run or more than normal time is taken to fix the part while the machine is running idle.
c. Delivery – The idea here is to get the part through assembly at minimum involvement. Each time the part is touch it added cost without any value being added.
d. Work Itself – the operation typically wants automated/efficient setup, however, many manufactures treat the time of molding changing setup as break time from production, a time that the staff take as break can be wasteful.
e. Inventory – Inventory is considered waste because it can add carrying cost and material handling cost. Excessive inventory even cost money should the part were to get obsolete and taxes or put negative cash flow.
f. Operator Movement – according to text book “any movement in which the operator does not add value to the part or service is a waste.”
g. Rejected Parts – rejected parts are considered waste because it can cost money and also tie up time that could have been used to make a good part.