The choice of materials depends largely on the subject. Centrally, it can be said that open ended materials should be used. 

Definition of open-ended materials:

Open-ended materials are objects or tools that have no specific purpose or fixed outcome. They can be used in a variety of ways and encourage creativity, imagination and problem solving. Examples include building blocks, natural materials (such as stones, branches or sand) or art materials such as paint and clay.

Use open-ended materials:

• Free play: Children are free to experiment and express their ideas without restrictions.
• Problem solving: They can use the materials to find solutions to self-imposed or given challenges.
• Creativity and imagination: The open-ended nature of the materials encourages children to think of new applications or constructions.
• Collaboration and communication: In group activities, these materials help to brainstorm and share ideas.
• Motor development: Manipulating open-ended materials helps develop fine and gross motor skills.
• Supporting inquiry-based learning: The materials provide opportunities for experimentation, making connections and understanding concepts.

The use of open-ended materials in the classroom promotes a learning environment where curiosity, autonomy and creativity are central. They are particularly suitable for topics that provide space for exploration and investigation, as in open-ended inquiry.

• Writing tools: Pens, pencils, or digital devices for individual reflection and note-taking.
• Paper or whiteboards: For students to jot down their thoughts, share ideas, or create diagrams.
• Prompt cards or questions: Printed or projected prompts related to the topic or subject
• Timer or clock: To manage the time allocated for each phase of the activity.
• Flipchart or projector: For presenting group ideas during the whole-class sharing phase.

Optional: -Markers or sticky notes for students to visually organize and display their thoughts