If buying a computer is recorded as a debit to the asset account and repairing the keyboard (after you spilt coffee on it) as a debit to the expense account, how would you record upgrading of the CD drive to one that could burn DVD's? What factors would you consider in deciding to record the upgrade as an asset or expense? Either way involves a debit to the left-hand side of the accounting equation, so does it matter how it is recorded?