Advice for Laboratory 2, Practise Exercise and Line Segment Intersection Notes. The main steps for the laboratory are as follows: 1. Ask the students to download Part 1 from ELM and follow the steps given. 2. Make sure that everyone can submit the assignment. 3. Present the problem given at the end of Tutorial 1 and ask the students to work on it. 4. Help the students formulate their problem and work on it. 5. Present the new model for line segment intersection and let the students continue to work. 6. Help the students complete the lab exercise.