Variations in asset accounts : On the basis of the double-entry principle, any increase in an account - considered as an asset - must be registered on the debit, on the other hand, when it means a decrease, it but be registered of the credit. In the example of pizza restaurant, the purchase of an oven, the account involved could be equipment, since it's classified as an active it increases it value and it is registered in the debit ($5500). If in the future the oven was sold, it means a decrease in the asset account and an amount in the credit. Variations in the liability accounts: In what has to do with the accounts grouped under the framework concept of liabilities, considering again the double-entry principle, all increases in in these financial accounts must be registered in the credit, while the decreases in the debit. In the example of a shoe store, when a payment is done to a financial institution for a credit, this decreases the loan it must be registered in the debit from ...