I am looking for a training schedule managment application.

I work for a training group, and we plan schedules for a training
course that we run in the following way:
- We choose which subjects should be taught (i.e. physics and computers)
- Then on each subjects we put more detail (what lessons are taught on
physics, what is the duration of the lessons, etc...)
- Each lessons has constraints. for example, some lessons cannot be
taught before another lessons was taught.
- Finally, we start to put the lessons on a training schedule. the
resolution may vary (weely, daily, monthly)

Do you any software application that may serve us well?

Thanks.