This lab can be used in the Go-Lab environment. Students working at a distance in two different ILSs share a seesaw, but can only interact with one side of the seesaw. They are able to place objects of different masses onto four different positions on their side of the seesaw. They can pass objects back and forth between each other. Teaching Tips: The Collaborative Seesaw Lab is primarily aimed at promoting collaborative problem-solving skills. Example tasks using this lab could include asking students to answer the following questions: Can you make the seesaw balance using only 1 object? If yes, then describe exactly how you made the seesaw balance. (This question can be also asked for 2, 3, or 4 objects. Note that you can never balance the seesaw with only one object on the seesaw). Can you guess which objects and what positions your fellow student is placing their objects? After using the Collaborative Seesaw Lab to foster collaborative skills, it is recommended that students proceed to develop their knowledge and investigate the physics of the seesaw situation. A very good lab for this objective is the Balancing Act Lab [https://go-lab.bms.utwente.nl/ils-editor/labs/652fa1f0299c34f253f5f538]. You can also add a second investigation phase to your ILS to include an additional lab. Instructions for use: If you create an ILS you have to create two versions, each one with one version (Lamp Intensity or Season of the Year) of the lab. One student in a pair should receive Lamp I