The correct answer to this open question is the following.
Although you did not include options for this question, we can say the following.
The next step they should follow in the reflective-thinking method is to establish the criteria for solving the problem.
This is the moment when the group has to establish the parameters and criteria to come up with options that can help them to solve the issue at hand.
The other final two steps in the reflective-thinking method are to evaluate the options in order to choose the best solution and finally to make the proper tests to implement the solutions in the real life.
It is very important to dedicate quality time to each step if they want to contemplate all the alternatives, once the problem has been studied and understood. This will be key to support the best decision and implementing it.