TOTAL COST OF OWNERSHIP (TCO) is a model developed by Gartner Group to analyze the direct and indirect costs of owning and using hardware and software. Managers of enterprise systems use various versions of TCO to lower costs while increasing the benefits of information technology deployments. The TCO includes: original cost of the computer and software, hardware and software upgrades, maintenance, technical support, and training. Most estimates place the TCO at about 3 to 4 times the actual purchase cost of the PC.
AIS is Accounting Information System.
SUBSTANCE OVER FORM is an accounting concept where the entity is accounting for items according to their substance and economic reality and not merely their legal form. This concept is one of the key determinants of reliable information. For most transactions there will be no difference, so no issue arises. In some cases however, the two diverge and the choice of how to present the transactions can give very different results. This difference occurs when an asset or liability is not recognized in the accounts even though benefits or obligations may result from the transaction, or oppositely.
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