Simon Holland found seneca:

• Significantly builds student knowledge“I did some action research which showed that use of Seneca appears to significantly improve mock performance year on year for similar ability students. You can see the extra detail and understanding in the students work too.”
• Significantly improves teaching efficiency and productivity“It's self marking and very easy to set up and run. Allows very easy monitoring of students homework, committment and progress with little effort.”
• Significantly saves school money“Its paperless and so saves lots of money on printing homework. Its free to use so much cheaper than other systems that are out there we have used in the past. Works brilliantly on mobile phones so very accessible”