do the experiment many times keep a record of all procedures make a model of the set-up of the experiment change some of the conditions of the experiment
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which step should a student do in order to be able to repeat an experiment?
Possibilities:
- do the experiment many times
- keep a record of all procedures
- make a model of the set-up of the experiment
- change some of the conditions of the experiment

keep a record of all procedures