The process of removing a system or component, ensuring proper handling of any environmentally sensitive materials, and sending the remainder to surplus storage or sale. (Mooz, et al 2003)
Mooz, H., Forsberg, K., Cotterman, H. 2003. Communicating Project Management. Hoboken, NJ, USA: John Wiley and Sons. p. 159.
It is critical to consider disposal from the very outset of the project. It is also not enough to consider only the end-of-life of the product(s) produced during the project. The process of producing a product will have byproducts which need to be managed and properly disposed of.