Yes to both questions!
* Planning prevents delays by identifying the needs of the job
* Planning enables Scheduling, by quantifying the resource needs in order for a block of time to be set aside to do the job
* Scheduling enables effectiveness by maximizing resource utilization in both Maintenance and Production
* Scheduling alone can improve effectiveness with only an estimate of labor needs by reducing the downtime between maintenance jobs, eliminating false starts when Production can't free up the equipment, and by reducing the downtime when Maintenance has to wait while Production shuts down and prepares equipment
* Together Planning and Scheduling are more effective on certain jobs
* Not all jobs are candidates for Planning or Scheduling