What is the difference between “start” and “early start” in project management?

When the analysis show schedule project management to obtain early start, early finish, late start and finish at the end of each tarea.La “early” represent the first dates you can perform a task, based on the durations estimated, and the sequence of tareas.La “late” dates are the last dates that a task can be set without affecting the project completion date. (If the first “and” late “dates are the same for a task must be programmed to occur on these dates or the project will be delayed. This type of task is said to be critical.) early and late dates that provide information about when you should / can schedule the task to start, but the date finally chooses his plan for the task to start would be known as the start date (planned). When the task actually starts, this would be known as the effective start date “- the possibility of a fourth class of the date home.