How does a portfolio's collection of work differ from that of a program's collection of work?

You are the program manager of the OFE Program. You are working with your program team and project managers to ensure that there is consistency in the execution of the program plan. You stress that the work has been planned and now the team must accurately complete the work. You want to ensure that the work is done correctly the first time in the program. What type of process are you stressing to your program team and project managers?

You are the program manager for your program and are creating a communications management plan. Management wants you to address the type of communications based on the number of communication channels you'll have within the program. Currently there are 345 stakeholders in your program but next week you'll have 387 stakeholders. How many more communication channels will you have next week in your program?

As a program manager you must also understand the project management lifecycle and the project lifecycle.
What is the difference between the two?

A program manager is concerned because several change requests in a component project are causing delays to the program's work package milestones. There are insufficient skilled resources within the component project to complete both the change requests and the milestone tasks.
What should the program manager do next to address this risk?