UNIVERSITY OF WEST ATTICA
SCHOOL OF ENGINEERING
DEPARTMENT OF COMPUTER ENGINEERING AND INFORMATICS
Design and Development of Information Systems
Development of a Unified Information System to Support Operational Operations of Health Units: Cash Management Subsystem
Vasileios Evangelos Athanasiou
Student ID: 19390005
Supervisor: Elias Dritsas, Senior Researcher
Athens, January 2025
This project involves the development of a Unified Information System designed to support the operational functions of health units within the National Health System. The focus of this specific work is the Cash Management Subsystem, commissioned by the Electronic Governance of Social Security (EDIKA) S.A.
The subsystem is designed to manage financial transactions with suppliers, monitor open liabilities, and execute payments, ensuring interoperability with the General Accounting and Budget modules.
| Section | Folder / File | Description |
|---|---|---|
| 1 | assign/ |
Assignment and competition material |
| 1.1 | assign/Announcement of Competition.pdf |
Competition announcement (English) |
| 1.2 | assign/WORK STATEMENT.pdf |
Work statement and project requirements (English) |
| 1.3 | assign/Διακήρυξη Διαγωνισμού.pdf |
Competition announcement (Greek) |
| 1.4 | assign/ΕΚΦΩΝΗΣΗ ΕΡΓΑΣΙΑΣ.pdf |
Assignment description (Greek) |
| 2 | docs/ |
Project and information system documentation |
| 2.1 | docs/IS-Cash-Management-ESY.pdf |
Information System for Cash Management – ESY (English) |
| 2.2 | docs/ΠΣ-Ταμειακής-Διαχείρισης-ΕΣΥ.pdf |
Cash Management Information System – ESY (Greek) |
| 3 | Gantt/ |
Project scheduling and planning |
| 3.1 | Gantt/Gantt_Diagram.mpp |
Gantt diagram (English – MS Project file) |
| 3.2 | Gantt/Διάγραμμα_Gantt.mpp |
Gantt diagram (Greek – MS Project file) |
| 3.3 | Gantt/Chart/ |
Gantt charts (PNG format) |
| 3.4 | Gantt/Time/ |
Project timelines and schedules |
| 3.5 | Gantt/Resources/ |
Resource allocation diagrams |
| 3.6 | Gantt/CashFlow/ |
Cash flow analysis diagrams |
| 4 | WBS/ |
Work Breakdown Structure documentation |
| 4.1 | WBS/WBS_Diagram.png |
Work Breakdown Structure diagram (English) |
| 4.2 | WBS/Διάγραμμα_WBS.png |
Work Breakdown Structure diagram (Greek) |
| 5 | Zachman/ |
Zachman Framework models and diagrams |
| 5.1 | Zachman/Data/ |
Data perspective (ER & logical models) |
| 5.2 | Zachman/Function/ |
Functional perspective (BPMN, workflows, flowcharts) |
| 5.3 | Zachman/People/ |
Organizational structure, RACI matrix, use cases |
| 5.4 | Zachman/Time/ |
Time perspective (PERT charts, roadmap diagrams) |
| 5.5 | Zachman/Zachman_Framework.png |
Zachman Framework overview diagram |
| 6 | README.md |
Repository overview and usage instructions |
- Supplier Invoice Entry: Processing and validation of supplier invoices.
- Obligations Monitoring: Tracking open liabilities, overdue debts, and providing tools for liquidity planning.
- Payment Management: Issuance of payment orders and automatic integration with the General Accounting subsystem.
- Reporting: Generation of balance sheets, supplier statements, and financial reports.
- Interoperability: Continuous data synchronization with Budgeting and Accounting subsystems.
The project follows the SCRUM methodology, an agile framework selected for its flexibility and suitability for complex, interoperable systems.
- Short Sprints: Functional deliverables produced every 2–4 weeks, reducing overall project risk.
- Risk Management: Daily stand-ups and sprint reviews enable early identification and resolution of issues.
- Stakeholder Collaboration: Continuous feedback ensures compliance with evolving regulatory and operational requirements.
The project is structured into four primary phases according to the Work Breakdown Structure (WBS):
| Phase | Description | Duration (Man-Days) | Estimated Budget |
|---|---|---|---|
| 1 | Project Initiation | 35 MDS | $20,000 |
| 2 | Subsystem Development | 84 MDS | $52,000 |
| 3 | Testing & Validation | 35 MDS | $30,000 |
| 4 | Delivery & Training | 49 MDS | $17,000 |
| Total | Entire Project | 203 MDS | $119,000 |
The architectural design is based on the Zachman Framework, addressing multiple views and abstraction levels:
-
Views:
- Data (What)
- Function (How)
- People (Who)
- Time (When)
-
Levels:
- Contextual
- Conceptual
- Logical
-
Modeling Tools:
- BPMN for business process modeling
- UML for user roles and system interactions
- ERD for data structure and relationships
This repository contains a documentation-centric Information System project developed in the context of the Development of Information Systems course.
The project focuses on the Cash Management Subsystem of a Unified Information System for health units of the National Health System (ESY) and is based on analysis, modeling, and project planning artifacts, not on executable source code.
This project does not require a runtime environment or software stack (no backend, frontend, or database server).
However, to properly view, edit, and evaluate the contents, the following tools are recommended.
- Windows (recommended, due to MS Project files)
- Linux
- macOS
Required for assignment texts and system documentation:
- Adobe Acrobat Reader
- Foxit Reader
- Any modern browser (Chrome, Firefox, Edge)
Required for diagrams and models:
- Default OS image viewer
- Any graphics viewer/editor
Required to fully open and edit:
Gantt/*.mpp
Alternative (read-only or limited support):
- ProjectLibre
- GanttProject
For understanding or extending the system design:
-
BPMN / UML
- draw.io (diagrams.net)
- Visual Paradigm
- StarUML
-
ER / Data Models
- draw.io
- MySQL Workbench (diagram mode only)
- Lucidchart
To fully understand the project, basic familiarity with the following concepts is recommended:
- Information Systems Analysis & Design
- SCRUM / Agile methodology
- Work Breakdown Structure (WBS)
- Gantt Charts & Project Scheduling
- BPMN workflows
- UML diagrams
- Zachman Framework
- Public sector financial processes (conceptual level)
Using Git:
git clone https://github.com/Development-of-Information-Systems/Cash-Management.git- Open the repository URL in your browser
- Click Code → Download ZIP
- Extract the ZIP file to a local directory
After extraction, the project can be explored directly:
assign/→ Official competition and assignment textsdocs/→ Information System documentation (EN / GR)Gantt/→ Project schedule, timelines, and resource planningWBS/→ Work Breakdown Structure diagramsZachman/→ System architecture and modeling views
No build or execution step is required.
Recommended starting points:
- System Overview
docs/IS-Cash-Management-ESY.pdfdocs/ΠΣ-Ταμειακής-Διαχείρισης-ΕΣΥ.pdf
- Project Planning
Gantt/Gantt_Diagram.mppWBS/WBS_Diagram.png
- Architecture & Design
Zachman/Zachman_Framework.png- Subfolders under
Zachman/(Data, Function, People, Time)
- Navigate to the
docs/directory - Open the report corresponding to your preferred language:
- English:
IS-Cash-Management-ESY.pdf - Greek:
ΠΣ-Ταμειακής-Διαχείρισης-ΕΣΥ.pdf
- English: