DESIGN AND IMPLEMENTATION OF A COMPUTERIZED SALES INVOICING SYSTEM.

ABSTRACT

The manual method of processing invoice as seen shortcoming ranging from slow services to inaccurate computations and poor records keeping. It is because of these problem inherent in the manual processing that led to the development and implementation of a new digital computer for the processing customers invoices named “Invoicing machine” or an invoicing software. The machine is programmed to calculate and print invoices from prepared to calculate and print invoices from prepared data carriers. Nowadays, different software firms are working towards developing a better and generic invoicing system which is the major concern of this work. The methodology adopted in getting information, personal interview and use of questionnaire. However a computer programme was designed to solve the problem of the study, after data analysis, the following findings were made:-
– The automated system saves time, human labour and reduces the amount of stress that workers face using the manual method.
– The method if implemented produces quicker and more accurate result than the manual method. However, the study recommendation that the Nigerian Bottling Company should adopt an automated system producing their sales invoices in other to meet the trend of the new age to satisfy their numerous customers.
ORGANIZATION OF WORK

In this project work, it is organized in seven chapters.
Chapter One – Is the introduction and this chapter contains application areas of computer in the business and discussion on the basis of invoice, statement of the problem, purpose of the study, aims ad objectives, scope of the study, limitations, assumption and definition of terms.
Chapter Two – Deals with review of related literature. This provides another path for learning the topic by looking at what other writers researchers have said about it.
Chapter Three – This chapter is concerned with description and enalysis of the existing system. This contains the manual operation of the invoicing system together with the facts and methods as well as its objectives and problems.
Chapter Four – This focuses on design of the new system. The system in chapter three is designed into based. It contains details of input, processing, storage, control and output requirement.
Chapter Five – This chapter deals with the implementation of the new system. This contains specification for the programs procedures, data resources and informations.
Chapter Six – This chapter is the documentation. This contains the details of systems definition, manual program specification as well as operating instructions.
Chapter Seven – Dealt with recommendation and conclusion. It discusses the recommendation for the use of this software together with it’s benefits.
Appendices
References
TABLE OF CONTENT

CHAPTER ONE
1.0 Introduction
1.1 Statement of the problem
1.2 Purpose of the study
1.3 Aims and objectives
1.4 Scope of the study
1.5 Limitations of the study
1.6 Assumptions
1.7 Definition of terms
CHAPTER TWO
2.0 LITERATURE REVIEW

CHAPTER THREE
3.0 Detailed study and analysis of old system
3.1 Fact finding method used
3.2 Organizational structure
3.3 Objective of the existing system
3.4 Input, process, and output analysis
3.5 Problem of existing system
3.6 Justification of the new system
3.7 Information flow diagram

CHAPTER FOUR
4.0 Design of the new system
4.1 Output design and specification
4.2 Input design and specification
4.3 File design
4.4 Procedure chart
4.5 System flowchart
CHAPTER FIVE
5.0 Implementation
5.1 Program design
5.2 Program flowchart
5.3 Pseudo codes
5.4 Source program
5.5 Test-Run

CHAPTER SIX
6.0 Documentation
6.1 System documentation
6.2 Program documentation
6.3 User documentation

CHAPTER SEVEN
7.0 Conclusion and Recommendation
7.1 Conclusion
7.2 Recommendation

CHAPTER ONE
INTRODUCTION
The present era can be best define as computer era. Because the computer is playing a key function. Electrical compute are used extensively in business to process financial data.
Computer had a major effect on the way, business are been run in commercial industries. This has not only revolutionized the accounting records keeping and reporting operations of traditional buying and selling services but has enable the growth of new computerized accounting packages such as invoicing packages, stick control packages, payroll packages, financial planning packages, sales ledge packages etc.
Invoicing which is the main concern of this research work has to do with the preparation of a source document by the seller that lists the items supplied, their cost and amount paid on them. In a small enterprise the buying may be done by the owner or by an employee. The manual method of processing invoices as seen in many business are seen to have some shortcoming ranging from slow services to inaccurate computations and poor records keeping. These problem inherent in the manual processing let to the development and production of a new digital computer between (1966 and 1973) for the processing of customers invoices. It was called “invoicing machine which is programmed to calculate and print invoices from prepared data carriers, nowadays developing a better and generic invoicing system are the concern of the different software firms and they are working towards it which the research work is dwelling on.

1.1 STATEMENT OF THE PROBLEM
The invoicing system of the organization in question is still being done manual, usually by clerical officers. This manual method of invoicing is time consuming and subjected to errors. The organization has reached a stage where it’s operation and activities should be computerized. This is because the volume of data in which routine tasks are performed is relatively very large. It is high time, this organization plunged into the field of artificial intelligences. The introduction of computer into it’s operations will automatically eliminate some, if not all, of the pr