This chapter presents some literature which is related to the study. The related literature has provided and serves the researchers a background which might help in the analysis of the system.
Conceptual Literature
Invoice as part of Billing System
Businesses even a small or a larger one always include invoice in the billing process. Issuing an invoice every time a transaction was made is part of the process. Mostafa (2005) stated, “Billing process includes receiving billing records determining the billing rates associated with the billing records, calculating the cost each billing record. Aggregating these records periodically to generate invoice, sending invoice to the customer the customer and collecting payments received from the customer. “This article shows the different process that the billing system must associate moreover it is also clear here that an invoice is essential between the customer and the company. It means that an invoice must be including to the billing system to be develop.
According to Singson(2009).“Sales invoice which is more popularly known as a “bill” is simply an itemized list of goods or services sold for which payment is due”. This statement about an invoice shows the relevance of it to the study.
An invoice must be enforcing to the billing system because it serves as a proof between the concerned parties that a payment was due.
Benefits of Billing System
In this highly competitive industry, making manual system being modernize was really an advantage for a company. A system like the sales invoice and billing system to be developed will serve a lot of benefits compared to the usual one. Patel (2000) stated that “small business billing system is there to help reduce errors that most generally annoy the customers “It is very obvious that the new system being develop for the PGA will surely give a lot of benefits.
Because of the speedy process the billing system will offer, more