well because when you are doing alot of stuff at once you want to think about what you can do next and you get caught up in what you are doing. So you really don't want to take a break and write down what all you have done. Plus when you usally conduct an experiment or run tests like we are doing its a very confusing and scattered up process. Well obvousliy your ideas change with the evidence you find. like the boxes for instance you might think that the object that is holding the white piecce of card board covers up the whole entire box