Five things to think about when starting a science club at school 1) How many children should I invite? This will vary depending on the space you have to run the club in, the experience you have, the number of children interested and many other factors. From our experience, we think 10-14 is optimum numbers, smaller than a traditional class size but big enough to have some decent conversations and gather enough data to be able to compare and discuss results. 2) Should I charge a fee to come to the club? As the educator leading the club, you will know whether this is something your school community can withstand. It is certainly helpful to have some cash to spend on consumables that your clubbers will use and it may be that your school might be able to provide a small amount of budget towards the running costs if charging would exclude some families. You might consider a BOGOF (buy one get one (or more) free) for families wi...