The course addresses issues related to the design, analysis and implementation of usable interactive systems. In particular, we will consider the following topics:
• overview of the issues that affect the interaction between humans and computers;
• the importance of the user interface;
• the existence of different classes of users and applications, and their impact on the design of user interfaces;
• the need for teamwork, and collaboration of figures with different skills in the draft interactive systems;
• an approach to the design of interfaces driven by models;
• the importance of the usability evaluation of the system,
• rules for accessibility;
• prototyping environments and graphic design (We will learn tool for for graphical design)
Detailed program
Interaction: human-machine interface, ergonomics,; complexity of the interaction.

HCI problems. Knowing the WEB: The roots of the Web: Hypertext; networks and browsers. Architectures, Web addresses.

Person-machine interfaces. Basic skills for the development of a Web system. Separating content and presentation. Need for design standards. Definition of the interaction model. Interface. Interface examples. Complexity levels of interaction.

Usability: definition, examples, Affordance and feedback. Definition of usability. Usability evaluation measures. Learnability and memorabilility. User manuals. Human centered design. Design vs implementation. Use cases.

User Design: interaction design, use cases, scenarios, actors, accessibility, design examples.

Web interfaces design: Fitts' law; browsing; accessibility; kinds of interaction; problems and specificity; Small World assumption; Interactive Objects; Prototyping.

Usability Evaluation: Criteria and metrics. Heuristic criteria of Nielsen and Norman. Usability tests: methodology and examples.

Knowing the user: Attention: selective and divisive attention. Memory: short-term and long-term memory How to take into consideration memory limits in in the design. The vision: eye anatomy; vision acuity; vision features; optical illusions.

Graphic design. Features: Clarity; Discriminability; Clarity; Conciseness; Consistency; discoverability; readability; comprehensibility. Minimalism vs. maximality. Role of the images. Grids and alignments. Visual pathways. Gestalt theory. Continuity Law; good form law; past experience law; proximity law; similarity Law; Closure law. Use of colors.

Text design: Colors and polarity; The Gulpease index; The text in the web; Legibility and readability. Guidelines.

Knowing the user: The motor system. Feedback, Fitts' law, exponential law of practice,

Design the error and guidelines

Study of a graphic presentation of the project and exam.

GIMP: Study on an open source environment for graphical design. Presentation of the final project.
An Open source IDE for App development

all the course materil is available at the course Moodle page https://moodle.unitus.it/moodle/mod/forum/view.php?id=14443
Main textbook
1. Interaction Design: Beyond Human-Computer Interaction, 5th Edition Helen Sharp, Jenny Preece, Yvonne Rogers ISBN: 978-1-119-54725-9 May 2019
2. R. Polillo. Facile da usare. Una moderna introduzione alla ingegneria della usabilità, Milano: Apogeo 2010