Michael Smith found little-bridge-premium-school-account:

• Significantly improves attainment“The fact that students do homework because they enjoy it, rather than just as an obligation. As a result, they recall the language learnt much easier.”
• Slightly reduces teacher workload“Teachers can simply check when students have or have not done homework - in this sense there is a reduction. However, teachers still have to use that information and adapt their classes accordingly.”
• Moderately improves teaching efficiency and productivity“As above - being able to check when work has been done at any time, without having to wait till the next class.”
• Does not significantly improve teacher knowledge and skills
• Moderately provides school data“In the sense that when explaining a student's progress (or lack of) to his or her parents, we can show or print a clear graph showing the work that has (or hasn't) been done. Parents often trust a printed page more than the teacher.”