1. 0 System Summary 1 Document Scope


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Use Case Model

for the
Coffee Maker II System
Submitted by
Dr. David A. Workman

COP 4232
June 4, 2003

Revised: November 13, 2003

by Jennifer Cardona

Table of Contents

Title Page


1.0 System Summary 1

1.1 Document Scope 1

1.2 Motivation and Business Case 1

1.3 Concept of Operation 2

1.4 Coffee Maker Architecture and Interfaces 5

1.4.1 Physical Design and Actor Interfaces 5

1.4.2 Operational States 6

2.0 Use Case Specifications 9

2.1 [Dis]Connect Power Source 9

2.2 Toggle Power Switch 10

2.3 Set Brew Time 10

2.4 Toggle Brew Mode 11

2.5 Set Wall Time 12

2.6 Brew Coffee 13

2.7 Toggle Hot Plate Switch 13

2.8 Fill Coffee Basket 14

2.9 Remove/Replace Coffee Basket 14

2.10 Remove/Insert Carafe 15

2.11 Fill Water Reservoir 16

3.0 System Requirements 17

3.1 Functional Requirements 17

3.2 Non-functional Requirements 18

3.2.1 Safety Requirements 18

3.2.2 Performance Requirements 19

3.2.3 Usability Requirements 19

3.3 Requirements Traceability 20

4.0 Glossary 22



Table of Figures


Title Page


Figure 1.3 Use Case Diagram for Coffee Maker II System 2

Figure 1.4-1. Coffee Maker II System Physical Design 5

Figure 1.4-2 Control Console 6

Figure 1.4-3 Transitions Controlling the Hotplate. 7

Figure 1.4-4 Transitions and Events Controlling the Brew Cycle. 7

Figure 1.4-5 Time Display Control States and Transitions 8

Figure 1.4-6a Brew Timer Control and Transitions 8

Figure 1.4-6b Wall Timer Control and Transitions 8

Figure 2-1. Collaboration Diagram for Set Brew Time 11

Figure 3.3-1 Functional Requirements Traceability Matrix 20

Figure 3.3-2 Non-Functional Requirements Traceability Matrix 21

1.0 System Summary

1.1 Document Scope



This document describes the functional requirements (use cases) and design constraints (non-functional requirements) of the Coffee Maker System as viewed from the perspective of the client, CafAdiksTM Home Products, and the system’s typical end user, the Coffee User. Its purpose is to formally capture and present an operational view of the Coffee Maker II system and to enumerate the system requirements as understood by the developer, COP 4232, Inc.

1.2 Motivation and Business Case



CafAdiksTM Home Products, hereafter referred to as “CafAdiks”, has observed declining sales of its current Coffee Maker system in the last three quarters due to a new line of coffee makers introduced by its competitors within the last year. As a consequence of this sales trend, the Marketing department of CafAdiks conducted a customer satisfaction survey (see Appendix A). The results of this survey (1000 customers responded) clearly indicate that customers are dissatisfied with the lack of features compared with CafAdiks’ competitors. Foremost among the deficiencies cited by customers is the lack of an automatic brewing function (80% of those responding to the survey) enabling the user to set the time of day at which the coffee maker would begin its normal brewing cycle. Another deficiency, earning second place in the customer survey (70% of respondents), is the lack of an external water level indicator, graduated by “number of cups”, showing the user the actual volume of water in the reservoir. A close third to the aforementioned deficiencies is the lack of control over the carafe hotplate (65% of respondents). Customers want the hotplate to automatically turn off (as a safety feature) one hour after the brewing cycle completes. In addition, they want to be able to warm the carafe between brewing cycles, rather than having to heat left-over coffee on the stove or in a microwave oven.
CafAdiks Marketing also conducted a survey of competitors’ coffee making systems and discovered that 75% of our closest competitors have two or more of the top three feature identified as deficiencies of the CafAdiks Coffee Maker. Marketing estimates that if CafAdiks releases a new line of Coffee Makers within the next six months, then sales should stabilize at 60% of market share (this would be down from CafAdiks’ previous market hare of 70%).
To recapture CafAdiks dominant position as producer of coffee delivery systems for home users, CafAdiks Marketing recommends that one or two new features should be added over and above features needed to address the above deficiencies. The new feature set together with an extended warrantee, accompanied by no more than a 30% increase in retail price, should enable CafAdiks to regain its leadership as the premiere coffee maker manufacturer in one year with 80% market share.
The remainder of this section and the next present a functional description and external design of the Coffee Maker II system, the proposed new line of coffee makers designed to achieve the business goals recommended by CafAdiks Marketing.

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