Independent Variables:
Amount of yeast put into bread
Amount of time bread is in oven
Whether the bread is kneaded or not
Amount of flour put in bread
Amount of time the bread is kneaded
If the bread is left to 'rest'
If anything is inside the bread (e.g. sugar or something idk....)
Heat at which the bread is cooked
Amount of water put in dough

That's all I can think up for nao....
Nighty nite :)