*** there were many years between sister roberta 's vision and its becoming reality , months of designing and prototyping , more months of project detailing with a large team of experts , years of concerted effort from the people of terra two , slight setbacks and unexpected breakthroughs , arguments over how things were to be done , mostly due to sister roberta 's impatience with the much slower schedule of the others , schedule that allowed for indulgences like personal lives , logistics and social calls .