You should have some system in place to make sure the procedure is carried out properly, and to your specifications, i.e. sometimes the teachers might forget to reinforce Martha. If you want to demonstrate that it is your procedure that produced the change of behavior you will need to withdraw it and see what happens. It should reverse, i.e. go back to the baseline level. Then, to be ethical, you will need to put the procedure in place again, all the while taking data to see if your procedure is continuing to work. A Final Comment Martha's case is quite common.
Many children engage in unusual behavior's to get the attention of adults.
In fact, it is the goal of behavior analysis to use such interventions just long enough to change a behavior and then to fade or reduce the procedure so that natural contingencies take over. We are not interested in making the child dependent on adults and specifically will program to avoid this. These include changing the types of activities, adding or deleting certain types of toys, or changing the schedule of activities to make them shorter or longer. These types of interventions may also play some role in cooperative behavior.