Definitions

Concept	Explanation
One teaching unit	The activity can be carried out within one hour of synchronous teaching (one lesson).
One week	The activity requires one lesson and individual work to be done outside school time.
2 - 4 weeks	The activity requires more lessons (2 to 10) and individual work; it might be referred to as a "didactic unit".
4 - 12 weeks	The activity requires several lessons (more than 10) and individual work; it might be referred to as a "didactic module".

Concept	Explanation
Digital books	Digital versions of textbooks submitted or available to students
Digital texts	Texts prepared and/or shared through a digital tool by the teacher and/or by the students with or without use of images
Multimedia presentations	Presentations prepared and/or shared through a digital tool which combines text and images, text and videos, text and sound (or further combinations), prepared by the teacher and/or by the students

Concept	Explanation
Student homework or project work	The teacher evaluates the work the student has done individually or in a group. The form of the work can be partially or completely decided by the student. The content of the work represents a further insight into a topic taught during the lesson(s).
Written online test	The teacher either submits a test through an online testing platform or sends a document; the students have to answer multiple-choice questions and/or open-ended questions.
Oral online interview	The teacher interviews one student at a time using a video-conference software or in person.