National University of Singapore

School of Computing

IT5004 Enterprise Systems Architecture Fundamentals

Assignment 1: Requirements Analysis

Easy POS

Easy POS (http://www.easypos.com.sg) is a new Point-Of-Sales (POS) solution that is newly launched to

provide easy to use POS solutions for various businesses. As a start, the service provider has built a

simple POS solution for the Food and Beverages (F&B) industry, specifically targeting restaurants and

cafes. The solution is a comprehensive solution to automate F&B operations. It comes with various

software and hardware requirements such as tablets for ordering and taking queue, a website for

customers to register as members online, and mobile application for businesses to push out deals to their

customers.

The Easy POS system generally allows 3 main types of users: general staff, managers, and customers.

General staff interacts with the system through the POS machine (Figure 1). Managers have the same

access as general staff except that they can perform additional features. These additional features

include voiding an order item or waiving certain charges such as service charge or Goods and Services

Tax (GST). They can also send promotional coupons to customers through the system. Customers can

receive these promotion coupons and apply them when making an order through the self-service tablet

placed at each dining table.

Figure 1 Example of a POS Machine

A staff must first log into the POS machine1 in order to use the system. Before a dish can be ordered, the

dish entry and its details have to be added. Each dish entry should capture details such as the name,

pricing, availability status, etc. These entries can be updated and “deleted” later on if there are any

changes. As each order transaction will consist of a list of dish items and quantity, we typically do not

physically delete entries away. Instead, it is a logical delete which will update the availability status to be

NOT_AVAILABLE. To make an order, staff will use the POS machine and/or the Easy POS admin mobile

app which can be installed on a tablet or smartphone. Staff can also view the list of order and order status

(e.g. PLACED, FULLY_SERVED, PAID, etc). The order status is updated when there are changes in the

order. For example, if a dish in an order is served, the status is manually updated as SERVED and when

all the dishes in the order is served, the order status is updated to FULLY_SERVED.

In addition to what a general staff can do, managers have additional access rights to perform other

operations. They can view the list of transactions (i.e. orders that have been made and paid) and their

1 The staff user accounts are created manually when the system is first setup

details to perform better planning. Managers can also see the list of customers who have registered

through the restaurant/cafe website2. By default, customers will receive birthday greetings, however,

managers may decide to send promotion coupons to their customers on their birthday month. They might

also send other general marketing mailers to their customers to make announcements (e.g. new dishes,

etc).

The system maintains an audit trail of any transactions and users who are involved. Thus, it will auto

logout once the session timeout. Alternatively, users can choose to manually logout in the event when

there is a change in the work shift.

As illustrated earlier, customers can register through the restaurant/cafe website and/or the Easy POS

customer mobile app. Once they are registered, they may receive marketing mailers or promotion

coupons (as emails or push notifications). One of the key benefits of installing the Easy POS customer

mobile app is the customers can make an order directly from the Easy POS customer mobile app instead

of waiting for staff to serve them.

To make an order, customers first log into the Easy POS customer mobile app and select the

restaurant/cafe branch3. Customers will then be presented with the list of available dish items4 where they

can then add the items and the quantity to the cart. At any point in time, customers can view the cart to

see the cart details and the cart amount. Once they are ready to check out from the cart, they will press

the “send order” button which will send the order to the Easy POS central server which can be seen by

the restaurant/cafe staff at their system. Should the customer want to make payment through the mobile

app5, they are given the option to make electronic payments (credit card). They can also redeem

promotion coupons by entering the promotion code. A digital receipt will be generated for any online

payment and the list of receipts from current (or past visits) can be viewed in the app. Note that the

mobile app only supports electronic payment through credit card. If the customers want to make a cash

payment, they have to still go through the payment counter at the restaurant/cafe, and the staff will

process their payment request. Customers will be given physical printed receipts if the payment is made

through the counter.

1. Draw an activity diagram to illustrate the key processes that need to take place before a transaction is

captured. You should assume that the system is newly set up (i.e. no data in the system) and the staff

is the one taking the customers’ orders. Please adopt the swim lane approach. You should make

your own assumptions (if it is not illustrated in the passage) to ensure that the flow makes

sense. State any assumptions after the activity diagram.

(6 marks)

2. Develop a use case diagram for the Easy POS system showing all the use cases and their

associated actor(s).

(6 marks)

3. Produce the fully developed use case description for the following use case using the given template.

Note that when writing down the flow of events, think about how a system would have to go

about processing the use case. You should make your own assumptions (if it is not illustrated

in the passage) to ensure that the flow makes sense. State any assumptions after each table

(if necessary). Do not forget to indicate what database record(s) is/are

created/updated/deleted.

(8 marks)

2 The Easy POS solution can be integrated onto the restaurant/cafe website.

3 You can assume that a customized Easy POS customer mobile app is deployed for each restaurant/cafe chain but there can be

multiple branches in the chain. For example, if Starbucks is using the Easy POS solution, there might be multiple Starbucks

branches.

4 Note the difference branches can offer different dishes

5 Customers can either make payment immediately when they submit an order or after they have finished their meals

Use Case: Make an order using the mobile app

Triggering Event:

Brief Description:

Actors:

Pre-conditions:

Post-conditions:

Flow of Events: Actor System

Exception Conditions:

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