How do you size models to a spesific vector3 value?

So I have learned frame and the uses are mainly to change position or orientation. But what I don't know is how to change the different sizes of a model via scripting.

I tried this script I found written by someone else

local scaleFactor = 1.01
local scaleFactor2 = 0.01
while scaleFactor2 < 1 do
	print(scaleFactor2)
	wait(0)
	for i , part in pairs(model:GetDescendants()) do
	     if part:IsA("BasePart") then
	          local partPos = part.Position
	          local offset = partPos - dilationCentre
	          offset = offset * scaleFactor
	          part.Position = dilationCentre + offset
	          part.Size = part.Size * scaleFactor
	     end
	end
	scaleFactor2 = scaleFactor2 + 0.01
end

It worked but it was hard to accurately change the size to a special vector3 size. Is there a way I can change a model to a vector3 value via script?

There is no way. Models do not have a size, it just keeps multiple objects in one place. You will have to resize the individual parts inside the model.