The most stressful days occur when there is extreme lack of organization in either the classroom, usually do to kack.of experience on teachers part, or a really bad rhythm and lack of clear expectations regarding children's behavior, which results in disciplinary issues among students, verbally abusive teachers, stressed out teachers, too many toddlers in one room and high and unrealistic expectations from a director, directors who are disorganized, lack of adequit supplies, etc. It puts the sub in a very awkward place. Many private, so called reputable schools have too many babies and toddlers in the same room; the ratio meets star requirements, but the quality of care diminishes and teachers assigned to these rooms know this. Someone at the top of these franchises ( as many of them are) are getting lots of money. The teachers are poorly paid and poorly trained or mentored. Ece unit requirement for job is 6 to 12 units.