THE USE OF WATERFALL MODEL IN APPLICATION DESIGN WEB-BASED MARYAM DEPARTMENT STORE

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Introduction
The development of computer has a lot of benefits and advantages, because the sophistication of computer make everything fast process. The use of computerization is efficient in various aspects of life, there are business, education or government. It can increase productivity in time and up-to-date.Computers and cell phones are used in supporting internet to search, process and obtain information on variety of applications [1].
According to [2] in Hendry Jaya, "Sales are activities carried out by seller in selling goods or services to earn a profit from these transactions or transfering the goods and services from seller to buyer. Many businesses use internet to operate the company activities both in marketing or selling process [3] it called e-marketing. Emarketing able to expand the market network and able to make customers easier to find the product information and transaction online.
Sales transactions at Maryam Department Store still manually, it has not been computerized so it requires accuracy in big transaction in managing data [4]. On the other hand, a computerized system makes the information received about the stock of goods easily and quickly [5].
Website-based sales information system facilitate easy transactions and information received by customers quickly and real time [6]. A web-based computerized system is be able to accommodate customer needs in searching, able to give ease ordered process supporting the professionalism of all employees and data processing automaticly [7] The department store sales application program includes incoming goods transactions, stock goods, and outgoing goods transactions to customers. This applications included in the point of sale application and can be applied in department stores or store warehouses.
With the existing problems to be more optimally, the management of goods sales at stores through website includes admin pages, it contain Master Data Suppliers, Goods, Units, Stocks, Users, Sales Transactions and report. The process of ordering and selling cosmetics is still manually by using telephone or coming directly to the shop then it will be recorded in the order book so that it is possible for errors record Waterfall Mobile applications using the Android platform with Augmented Reality technology and be able to display brochures in an attractive and realtime manner.

Ratih Wahyuningrum
To find out the reason of interest and un-interest in online buying towards ecommerce website and to analyze e-marketing strategies to increase people's online buying interest in fashion products.
Qualitative and quantitative research methods with a descriptive approach Analisis dan perancangan strategi e-marketing sebuah perusahaan pada produk fashion sangat diperlukan untuk mengetahui titik kekuatan dan kelemahan competitor demi meningkatkan omzet perusahaan Analyse and design of a company's e-marketing strategy on fashion products is needed to determine the strengths and weaknesses of competitors in to increase company's omzet.

Amelia, Joni Devitra
Inventory data management is still manually Prototype Inventory management information system prototype at Advan Service Center Jambi

Dewi Laraswati, Marlina
Information is still limited and conventionally, the ordering process is not flexible and data processing is not automated Waterfall Produce a web-based wedding package information system to accommodate customer needs in finding wedding or catering information Dewi Laraswati The sales system is still manually or there is no automation process in processing sales data for heavy tools at PT. HKP. The factors of main problem include data, Waterfall Sales information system design is expected to solve the existing problems at PT.HKP documents, methods and human resources

Research Method
This research used case study method by conduct the investigation at Maryam Department Store and several similar stores, especially in sales sector, until the existing problems are found. The system development model used is the waterfall model. The steps of this model are divided into five steps: a) System Requirements Analysis At this step, system requirements analysis is the first step to collect data, problem identification, problem solving suggestions, and system requirements analysis focused on making an application. b) Design Design is the step where design is provided into the expected design by using UML, Entity Relational Diagram (ERD). c) Code Generation In this step, the application of the design results is implemented into a program computer system by using OOP programming (object-based orientation). d) Testing In testing step, the program must be tested and focused on ensuring that all existing commands have been tested and external functions by using black box testing. e) Support Support is maintenance of data in applications regularly.

Software Requirements Analysis A. Phase of Analysis
The department store sales system is made on a web-based in cash . It consists of customer table, goods table,  user table and sales transaction table. In running program, the cashier can use a media browser. The following is described the needs of the Department Store sales system:  Figure 2 Activity diagram login.
In Figure 1 above illustrates a diagram of the activity of the user when loggin by entering their email and password.

D. Entity Relationship Diagram (ERD).
ERD is used to describe a data model from a database into a system. It consists of entities, attributes and relationships. The image below is an ERD model from the database used in Information System for Implementation in database design in sales system application at Maryam Department Store by using MySQL