You are quite correct, you can book a 4 week course at a University in Lisbon for approximately half the price. Having checked it out though, the University course require a minimum of 8, and a maximum of 15 students per class level. On the programme we offer the maximum class size is 8 students, and on average there will be classes of 4 to 7 students, so you receive more teacher attention for your time/money invested. You can also book shorter or longer courses, depending on your preference and have a greater range of start dates to choose from.