How to interpret the Reform Programs tab in Prison Architect?

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In Prison Architect, the user can start/stop reform programs via a tab -- see image for details:
I understand that each program has a certain capacity, which is shown by the light gray squares. Occupied spots are shown in black. The session times and "ACTIVE" indicators are clear enough.
Beyond these things, how can I read this tab? In particular:
- What do the different colored boxes (green, yellow, black) indicate? Prisoner type, concentration, or success estimate?
- Does the bigger box indicate the session leader (teacher, psychologist, foreman, doctor, etc.)?
- What do the red lines mean? Why are some longer than others?
- What does the "Reschedule All Programs" button do?
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How do you get reforms up in prison architect?
Working in the library, mailroom, kitchen, shop, laundry ect helps increase their reform points. Even if they are standing around doing nothing because they have completed their job, they are still technically working. If you have alot of work, add short breaks inbetween.Is there an end to prison architect?
Instead of the game simply ending, the player is still allowed to view their prison in its final moments. This is similar to how Dungeon Keeper operated when the player met with failure; they would become a ghost and could watch their dungeon crumble.How do you stop suppression in prison architect?
If you want to reduce suppresion, use fewer armed guards or none at all. When giving out punishments, consider using a shorter one. Normal guards can suppress prisoners in large numbers as well. You can use the prison policy to reduce the supression effect.How do you satisfy needs in prison architect?
How to satisfy exercise: Even the fattest inmate needs to exercise, which is why you should have at least one yard designated in your prison. Each yard needs to have at least a few workout machines to regularly keep inmates' exercise need low. If your need is high, build more exercise machines.Prison Architect #15 - Regime and Programs
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