In the period from Alfred's reign to the Norman Conquest scribes and artists in southern England once more achieved a high standard in bookmaking, comparable to the brilliant tradition which had been established in both the north and the south in the eighth century. Some codices survive which are rough in execution, written on poorly prepared membrane by unskilled hands, but the majority – by no means chiefly service books produced for ecclesiastical and royal patrons – demonstrate that by the end of the tenth century a large number of scribes understood the techniques of careful preparation of membranes and inks, had mastered the letter-forms of two scripts, Caroline minuscule and Anglo-Saxon square minuscule, and were disciplined to follow consistently a hierarchy of scripts for the openings of texts and major divisions, chapter titles, incipits and explicits. What remains must be only a fragment of the production of Benedictine monks and nuns, secular clerks and lay scribes. But however incomplete and unbalanced the evidence, the over-all level of accomplishment cannot be doubted.