Recommended Reading: Productive Math Struggle: A 6- Point Action Plan for Fostering Perseverance by John J. SanGiovanni, Susie Katt and Kevin J. Dykema.
Mathematical Mindsets by Jo Boaler
Mathish by Jo Boaler
YouCubed a website by Jo Boaler's group at Stanford. This site not only has research to support your work with productive struggle but also has advice for techniques such as math norms to use with your class.
SEE THE TASKS PAGE FOR LOTS OF IDEAS OF ACTIVITIES THAT WILL PROMOTE PRODUCTIVE STRUGGLE.