I decided to study the problem of how to pass from a lesson-based classes to task-based classes. I realized that I need books, articles or some kind of information which provides me the “theory” of how to transform my classes into task-based ones.
For now, I bought “5 Practices for Orchestrating Productive Mathematics Discussions”  and “5 Practices for Orchestrating Productive Task-Based Discussions in Science”  of National Council of Teachers of Mathematics. I hope these books give me the ideas that I need.
 Cartier, J.L., Smith, M.S., Stein, M.K., and Ross, D.K. Practices for orchestrating productive task-based discussions in science. National Council of Teachers of Mathematics, 2013.
 Stein, M.K. and Smith, M.S. 5 practices for orchestrating productive mathematics discussions. National Council of Teachers of Mathematics, 2011.