The handling of fixed assets requires the use of several rigidly defined procedures to ensure that transactions are recorded and valued properly. The largest set of fixed asset controls relates to the acquisition of fixed assets; given the sometimes massive costs required to install fixed assets, it is entirely appropriate to install rigorously enforced controls over the acquisition process. Given the significant amount of funds usually needed to acquire a fixed asset, there always should be a formal approval process before a purchase order is issued. Depending on the size of the acquisition, a number of approval signatures may be required, extending up to the company president or even the chair of the board of directors. The key controls used once an asset is installed are to tag it, assign specific responsibility for it, and ensure that any asset transfers are approved by the shipping and receiving managers. Finally, asset disposition controls call for regular disposition reviews to ensure that dispositions occur while assets still retain some resale value.