UNIVERSITY OF WEST ATTICA
SCHOOL OF ENGINEERING
DEPARTMENT OF COMPUTER ENGINEERING AND INFORMATICS

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Software Engineering

Preze Cinemas Desktop – Phase 3
Robustness Diagram Design

Vasileios Evangelos Athanasiou
Student ID: 19390005

GitHub · LinkedIn

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Supervision

Supervisor: Georgios Prezerakos, Professor

UNIWA Profile · LinkedIn

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Athens, August 2023

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README

Preze Cinemas Desktop - Phase 3 Robustness Diagram Design

This README documents Phase 3 of the Preze Cinemas Desktop project.
This phase focuses on the structural and behavioral system design using Robustness Diagrams, bridging requirements analysis and detailed system design.

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Table of Contents

Section	Folder/File	Description
1	assign/	Assignment instructions and supporting material
1.1	assign/seng_instructions_2022_23_v2.pdf	Assignment instructions (English)
1.2	assign/λμηχ_οδηγίες_2022_23_β2.pdf	Assignment instructions (Greek)
2	diagrams/	Robustness diagrams for cinema system use cases
2.1	diagrams/EN/	Robustness diagrams in English
2.1.1	diagrams/EN/1. Register.png	Robustness diagram — User registration
2.1.2	diagrams/EN/2. Login.png	Robustness diagram — User login
2.1.3	diagrams/EN/3. Check Availability.png	Robustness diagram — Availability checking
2.1.4	diagrams/EN/4. Ticket Selection.png	Robustness diagram — Ticket selection
2.1.5	diagrams/EN/5. Movie Selection.png	Robustness diagram — Movie selection
2.1.6	diagrams/EN/6. Time View selection.png	Robustness diagram — Show time selection
2.1.7	diagrams/EN/7. Download transaction receipt.png	Robustness diagram — Receipt download
2.1.8	diagrams/EN/8. tickets download.png	Robustness diagram — Ticket download
2.1.9	diagrams/EN/9. Payment.png	Robustness diagram — Payment process
2.2	diagrams/GR/	Robustness diagrams in Greek
2.2.1	diagrams/GR/1. Εγγραφή.png	Διάγραμμα robustness — Εγγραφή χρήστη
2.2.2	diagrams/GR/2. ΕίσοδοςΧρήστη.png	Διάγραμμα robustness — Είσοδος χρήστη
2.2.3	diagrams/GR/3. Έλεγχος διαθεσιμότητας.png	Διάγραμμα robustness — Έλεγχος διαθεσιμότητας
2.2.4	diagrams/GR/4. Επιλογή Εισιτηρίων.png	Διάγραμμα robustness — Επιλογή εισιτηρίων
2.2.5	diagrams/GR/5. Επιλογή Ταινίας.png	Διάγραμμα robustness — Επιλογή ταινίας
2.2.6	diagrams/GR/6. Επιλογή ώρας προβολής.png	Διάγραμμα robustness — Επιλογή ώρας προβολής
2.2.7	diagrams/GR/7. Λήψη Αποδεικτικού Συναλλαγής.png	Διάγραμμα robustness — Λήψη αποδεικτικού συναλλαγής
2.2.8	diagrams/GR/8. Λήψη Εισιτηρίων.png	Διάγραμμα robustness — Λήψη εισιτηρίων
2.2.9	diagrams/GR/9. Πληρωμή.png	Διάγραμμα robustness — Πληρωμή
3	docs/	Compiled robustness diagram documentation
3.1	docs/Robustness-Diagrams.pdf	Robustness diagrams document (English)
3.2	docs/Διαγράμματα-Robustness.pdf	Robustness diagrams document (Greek)
4	README.md	Repository overview and usage instructions

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1. Project Overview

Phase 3 transforms previously defined use cases into robustness diagrams, helping identify:

• Boundary objects (user interface interaction)
• Control objects (system logic)
• Entity objects (data and persistent information)

The diagrams were produced using Visual Paradigm and represent internal system behavior during major operations.

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2. Deliverables – Robustness Diagrams

2.1 User Access & Security

2.1.1 Registration

Handles creation of new user accounts including:

• Customer information input
• Password validation rules
• Creation of records in the cinema database

Password rules require at least:

• One uppercase letter
• One numeric character

2.1.2 User Login

Responsible for:

• Credential validation
• Database verification
• Success or error feedback handling

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3. Selection & Scheduling

3.1 Movie Selection

Allows users to:

• Browse available movies
• Select viewing formats such as:
  • Standard projection
  • Dolby Atmos
  • 3D screenings

3.2 Viewing Time Selection

Displays available screening times retrieved from the database.

3.3 Ticket Selection

Manages ticket selection for chosen screenings, including seat selection logic.

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4. Inventory & Transaction Management

4.1 Availability Check

A core logical process that:

• Verifies seat availability
• Allows reservation continuation with fewer seats if necessary
• Supports waiting list functionality to notify users when seats become available

4.2 Payment Processing

Handles interaction with an external banking system to:

• Validate payment details
• Verify account balance
• Confirm or reject transactions

4.3 Transaction Receipt

After successful payment:

• Reservation completion is verified
• A downloadable proof of transaction is generated
• Digital receipt becomes available to the customer

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5. Summary Table of Use Cases

Use Case ID	Name	Key Interaction
5.1.1	Registration	Account creation & password validation
5.1.2	User Login	Credential verification
5.1.3	Movie Selection	Film and format selection
5.1.4	Viewing Time Selection	Screening schedule retrieval
5.1.6	Availability Check	Seat allocation & waiting list
5.1.7	Payment	Banking system interaction
5.1.8	Receipt Generation	Transaction proof generation

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6. Phase 3 Objective

This phase serves as the transition point from requirements analysis to system design, ensuring all major user interactions are translated into structured internal system behavior.

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7. Conclusion

Phase 3 refines system functionality by modeling how internal components collaborate during user operations. These robustness diagrams provide a solid foundation for the next development stage, enabling smoother implementation and clearer system architecture decisions.