After doing and evaluating my experiment/model, I decided to redo it (changed some small things based on the results of that experiment), because I believe that this new way would give me even more insight into what I am studying.

How do I properly report this in a thesis? Specifically, where do I mention the description of the second experiment that was done?

The structure of my master thesis is this:

… 4. Experimental procedure 5. Results 6. Discussion 7. Conclusion

Currently I have the original experiment/method in the ‘Experiment’ section, but I am struggling to find a good place to mention the second/improved experiment/method.

Any suggestions are much appreciated