Overview
The computerized system has a big contribution in our society such as they can do very detailed work and follow precise instructions without error. In order to know the problem encountered by the staff, the researcher conducted an interview in the Rehabilitation Center located at Sto Niño, Magalang Pampanga. These are some problems in our chosen local like no proper record of the staffs, patients, billing, and retrieval of data is time consuming and more chances of human error.

The basic advantages of the proposed system are to make the process efficient and fast which means they can process information much more quickly than humans. The retrieval of data is very slow it has to be searched in lots of registers and these waste lots of time. In the existing system receipts are recorded manually that causes data is not always reliable as it is hand written and some human errors might have occurred. Mostly data is kept on registers and these are stored in filling cabinets and this consumes a lot of space.

Inventory is the total amount of goods or materials contained in a store or factory at any given time. The staffs need to know the precise number of items on their shelves and storage areas in order to place orders or control losses. They need also to know how many units of their products are available for patient’s reservation. All of these businesses rely on an inventory system to provide answers.

The billing system should provide service to the user, collect user usage records, and collect payments and adjust customers’ balances. The patient account includes the patient contact profile information, account type, login information, and payment method.

Each patient account is linked in the system with specific services offered to this patient, and the patient will be billed depending on his usage of these services.

The propose system is a combination of Billing and Inventory system. Generally, it will surely help the staffs to make works easier and faster using this very user-friendly system.

Objectives of the Study
General Objective
The General objective of the study is to help the staffs to make a computerized system and to finish works at exactly given time and to make a system that is reliable to avoid some human errors which might have occurred for example, unsecured data stored anywhere and it can be steal and used against the Rehabilitation Center. Specific Objective

1. To create secured billing and inventory system.
2. To avoid consuming a lot of time in recording information. 3. To make a printable receipt.

Theoretical Framework
Theoretical framework is use to limit the scope of the relevant data by focusing on specific variables and specifying the specific frame or viewpoint that the researcher will take in analysis, and interpreting the data that will be gathered, understanding concepts and variable according to the given definitions, and building knowledge by validating the theory. Records management means the planning, controlling, directing, organizing, training, promoting, and other managerial activities involved with respect to records creation, maintenance, use, and disposition in order to achieve adequate and proper documentation of the policies and transactions of the Government and effective and economical management of agency operations.

Payment included in the system, it is the process of collecting money from the patient and adjusting their balances through adjusting the account debits and credits. The patient receives receipts of their payments.

The inventory system is updated each time you take an item, so you know what you have available for the following day or week. The Inventory System supports updating inventory information for all items, monitoring inventory depletion, and importing and exporting inventory information to and from external systems of record.

Local Study
Computer patient’s.