Yosef Karo

“ Paragraph 3 - If the woman kneading is tearing the dough in pieces [and in the process moistening her hands] with water, she should not use the same water that she uses to cool her hands because these waters will get warm and make the dough rise. Instead, she should have a dish full of water to moisten the dough. ”

“ The Place and Order of Kneading the Matzos
מקום וסדר לישת המצות
Paragraph 1 - We do not knead where there is sun. On a cloudy day, it is forbidden [to knead] outside because on a cloudy day, all is [legally] sunny. Rem"a: Therefore, the practice is to be careful not to knead near an open window, even if there is no sun there, lest it be cloudy and one not notice (Trumat Hadeshen chapter 122) . ”

“ One should be stringent to hurry when making matzos, because there is concern that the waitings will aggregate to a mil or that one will be in a warm place where rising happens quicker (HAgahot Maimoni chapter 5 and Mordechai chapter Elu Ovrin) . After dealing with the dough and warming it with your hands, if it is left idle, it will rise immediately. If one started with two pieces of dough simultaneously and one rose, the other also rose, even if no signs of rising are visible. ”