Problems with Transparency ?

function AdvancedLoad()
	local f = game.Workspace:GetChildren()
	for i = 1,#f do 
		if f[i].Name == "Program" or f[i].Name == "SProgram1" or f[i].Name == "SProgram2" then 
			local things = game.Workspace.f[i]:GetChildren() 
			for e = 1,#things do 
				if things[e].ClassName == "Part" then 
					for a = 1,100 do 
						wait()
						things[e].Transparency = things[e].Transparency - 0.01 
					end 
			    elseif things[e].ClassName == "TrussPart" then 
				    for b = 1,100 do 
					    wait()
					    things[e].Transparency = things[e].Transparency - 0.01
				    end 
				elseif things[e].ClassName == "WedgePart" then 
					for c = 1,100 do 
						wait()
						things[e].Transparency = things[e].Transparency - 0.01
					end
			    elseif things[e].ClassName == "Model" then 
				    local parts = game.Workspace.f[i].things[e]:GetChildren() 
				    for j = 1,#parts do 
					    if parts[j].ClassName == "Part" then 
						   for d = 1,100 do 
						   wait() 
						   parts[j].Transparency = parts[j].Transparency - 0.01
						   end
						end
					end
			    end
			end
		end
	end
end

For my holo, I tried to make the programs appear gradually instead of popping up. This is the function I came up with (which is called later in the script). However, whenever I try to start a program, it doesn't work, and the maps still stay transparent, because I set them at Transparency 1. Could anybody help me with this problem?

It first should be said that your vairable names are pretty bad. You always want to make your variables relating to the object they're equaling, for readability purposes. Readability is arguably even more important than functionality, as readable code is much easier to debug and easier to make more efficient.

Your main functionality problem is the code (line 5)

game.Workspace.f[i]:GetChildren()

Although it may seem like you could use f[i] in a path like this, you can't. What the script is basically doing is looking for a child named "f" in Workspace, then looking for a child named the value of i in "f". You therefore get the error, "f is not a valid member of Workspace"

You could convert f[i] to a string, then access it with brackets;

game.Workspace[tostring(f[i])]

but this is pointless.

You already have access to the object, so just use it. No need for the path.

f[i]

Now your code will function, but it should be noted that it will only make one part visible at a time, so if you have more than 10 parts in your model this will take an extremely long time. It takes a little less than 3.5 seconds to make one part fully visible -- and it will not move on to the next part until the first is completed.

You just need to reverse the loops, i.e.

for i = 1,100 do
	wait()
	for _,v in pairs(model:GetChildren()) do
		--no wait() in this loop, so it will complete almost instantly
		v.Transparency = v.Transparency - 0.01
	end
end

Although it would probably be better to just use the for loop's variable directly:

for i = 1, 0, -0.01 do--startNum, endNum, increment
	wait()
	for _,v in pairs(model:GetChildren()) do
		v.Transparency = i
	end
end

One last thing I'll let you know is that instead of all those elseifs, you can just use :IsA("BasePart"). This method will return true if the thing it is called on is what was stated in the parentheses. BasePart is a class that includes all Part objects.