Ah in fairness, the teacher and the students all see the same brief from the SEC on the same day. Teachers don't get any more info that you do regarding what 3 validated parameters are or what the what-if questions might be. I'd never once used the sklearn module before reading this brief and wouldn't have done it in class at all. These tools are just one way I found over christmas that could tick the box here but there are many other ways I'm sure. Advanced requirements usually require some exploration and research and code snippets that you wouldn't do in class every day. They don't envisage 100% of student being able to tick all of the ARs off. They need a bell curve of grades for the project. As for what they mean by a model that has 3 parameters, my interpretation (which isn't necessarily correct) is that they want a model (meaning some maths that predicts the future or simulates some event). This model should have 3 parameters. 3 parameters in programming usually means 3 inputs into a function eg. def funky(a,b,c): Think of it as a box with entry doors and 1 exit door at the back. Some maths happens in the box (your model). For example, the physics formula for potential energy is E = m x g x h In that example, the output is the Energy, the three parameters are mass, gravity and height. The mathmatical model is that you multiply them. (Sklearn is the module that figures out the equation or model for you. It does so based on patterns in your previous inputs and outputs in your csv file.) What if questions could be: -What happens to the energy if I double the height? -What is the Energy (E) if the three paremeters are set to100kg, 100ms-2, 100m -What values for the three parameters would give me an energy of 100J? Litterally any question at all that involves a prediction is a What-If Question. So there are an infinite ammount of What-If Question you can ask.

@@DanielMurrayMakes Thanks very much, helpful examples! Would you say a health tracker is a max H3/H4 project? Seen as probably 90% of people are doing it? Or does it more matter about the effort you put into the report and the modelling project from the data you took from your microbit

As long as your project meets all of the requirements and you clearly show it in your report, it may get anything up to a H1, depending on your report. I can't speak for future years but there has never been any extra marks for adding another 2000 lines of code or launching a rocket into orbit. Marks are most often lost due to students leaving parts of the report out or half answering a section with hardly any detail. You can see on page 11 of the brief, the report is 74% of the marks. @@24tgjuygbjg13