For parents who have children who have a hard time separating, as far as preschool is concerned, they crying, the grabbing, the holding on. First and foremost, you should know that is actually okay. Many children go through it and it is age appropriate. What parents and adults don't realize is that children don't think about their entire day the way we do. Our job as parents and adults is to relay that to them. For example, "Mommy is taking you to school this morning. You are going to go and get to have fun with your friends. You are going to play games." You go through the day as briefly as possible and the child will settle in to the idea of what the day has in store for them. Then you need to say, "Mommy or daddy will be here at the end of the day to pick you up." You need to make sure that you are there and on time, so that the child can know that they can trust this process. The other part which also deals with trust is letting your child know that the adults in that environment are very trustworthy. When you show the child that the adults they can trust. They can find comfort in that environment as well.