Kay found Twig World:

• Slightly improves attainment“We don't really have a way to measure this”
• Moderately builds student knowledge“Students gain a clear detailed understanding of the key information”
• Slightly reduces attainment gap“Not possible to measure”
• Significantly improves teaching efficiency and productivity“It saves me time looking for videos of youtube which are often poor quality or incorrect. Instead of students listening to my own long-winded explanations they get short, to-the-point explanations accompanied by great visuals.”
• Significantly reduces teacher workload“I don't have to look for videos on youtube. I can use the transcripts to make my own worksheets. I can set videos as homeworks.”