---
title: I will not be able to attend a Masterclass/Boost'Hours/Ice-Breaker
description: "Masterclass: Attendance is mandatory, so you must notify your cohort leader to justify your absence.\n\nBoost'Hours: This is an in-depth session on a topic or theme and your presence is not mandatory.\n\nIce-Breaker: This is a session at the beginning of the course to help you get to know your cohort. Your presence is not mandatory but we advise you to attend!"
---

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# I will not be able to attend a Masterclass/Boost'Hours/Ice-Breaker

- **Masterclass**: Attendance is mandatory, so you must notify your cohort leader to justify your absence. You can use this form to report your absence: [https://share.hsforms.com/1e-2ami0VTjOrMQlqytwkCQbt1yj](https://share.hsforms.com/1e-2ami0VTjOrMQlqytwkCQbt1yj)
- **Boost'Hours**: This is an in-depth session on a topic or theme and your presence is not mandatory.
- **Ice-Breaker**: This is a session at the beginning of the course to help you get to know your cohort. Your presence is not mandatory but we advise you to attend!

- [🏤🎓️Administrative questions](https://help.datascientest.com/en/b2c/knowledgebase/%EF%B8%8Fadministrative-questions?hsLang=en)
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