I guess you could argue 3 seperate scenarios.
One is the "Legacy of the Herorot" scenario. One way trip with no real followup, or very long gaps between contact (years, not months).
The next, is the supported colony as Badbru discusses. Most of early America was like this.
And finally, there's the decline of a more advanced civilization.
The technological hurdles are two fold: knowledge and resources.
I think most of us would agree that knowledge would not be a limiting factor. Experience, yes (it's one thing to know how to build a steam boiler, and another to actually do it). Granted, we take ubiquitous knowledge for granted today (between Google and Amazon, we can learn pretty much anything of practical value today). But even a robust colonization effort would have decent knowledge transfer (bringing two paper copies of "Encyclopedia of Colonization" covering everything from structural engineering and animal husbandry to basic pharmaceuticals and agriculture). "Here's everything you need to know about how to build a machine to read these CD-ROMS which will have everything else you need. When you can build a machine that can read the media, you're ready for the material on the media."
Seriously, for the skeptical, imagine taking vast amounts of information, compressing it, using any algorithm, and printing out the result on durable stock. Describe the algorithm in plain language, and let the bored "Monks" start decoding it in their free time -- by hand if necessary. (There's a competition to compress Wikipedia -- they have 100MB down to 16MB now.)
So, anyway, I'm assuming that knowledge can be transferred to the colony, and recoverable.
Next is resources.
The nut there will be metals, frankly. Finding a supply near enough to the colony and processing it properly. It takes a lot of work to extract metal from the ground, the Earth does not give up its bounty easily. But anyone who has studied mining and prospecting knows that two guys with some picks, shovels and a mule can make large holes in hard rock given time. It's a LOT of work, but it can be done.
But you have to build up that labor pool and be able to have enough to allocate to other production besides simply food and shelter.
That's where the horses and cattle and other beasts of burden come in. It's cheaper to have a stable hand care for a few dozen animals which can then be used for, well, horsepower. Better to have 4 horses driving a water pump than 4 men. They grow faster, can pull more weight, and you can eat them when you're done. And the 4 men could be tending to other animals. Beasts of burden are great force multipliers.
So, in truth, I think that colony placement has the largest affect on colony success. The closer to resources useful for industrialization, while still being able to feed the colony, the faster that industrialization can occur.
But putting the colony on a desert island with nothing but mango, coconuts and fish gives you a fishing colony -- and perhaps a bunch of hot chicks running around half naked.
One is the "Legacy of the Herorot" scenario. One way trip with no real followup, or very long gaps between contact (years, not months).
The next, is the supported colony as Badbru discusses. Most of early America was like this.
And finally, there's the decline of a more advanced civilization.
The technological hurdles are two fold: knowledge and resources.
I think most of us would agree that knowledge would not be a limiting factor. Experience, yes (it's one thing to know how to build a steam boiler, and another to actually do it). Granted, we take ubiquitous knowledge for granted today (between Google and Amazon, we can learn pretty much anything of practical value today). But even a robust colonization effort would have decent knowledge transfer (bringing two paper copies of "Encyclopedia of Colonization" covering everything from structural engineering and animal husbandry to basic pharmaceuticals and agriculture). "Here's everything you need to know about how to build a machine to read these CD-ROMS which will have everything else you need. When you can build a machine that can read the media, you're ready for the material on the media."
Seriously, for the skeptical, imagine taking vast amounts of information, compressing it, using any algorithm, and printing out the result on durable stock. Describe the algorithm in plain language, and let the bored "Monks" start decoding it in their free time -- by hand if necessary. (There's a competition to compress Wikipedia -- they have 100MB down to 16MB now.)
So, anyway, I'm assuming that knowledge can be transferred to the colony, and recoverable.
Next is resources.
The nut there will be metals, frankly. Finding a supply near enough to the colony and processing it properly. It takes a lot of work to extract metal from the ground, the Earth does not give up its bounty easily. But anyone who has studied mining and prospecting knows that two guys with some picks, shovels and a mule can make large holes in hard rock given time. It's a LOT of work, but it can be done.
But you have to build up that labor pool and be able to have enough to allocate to other production besides simply food and shelter.
That's where the horses and cattle and other beasts of burden come in. It's cheaper to have a stable hand care for a few dozen animals which can then be used for, well, horsepower. Better to have 4 horses driving a water pump than 4 men. They grow faster, can pull more weight, and you can eat them when you're done. And the 4 men could be tending to other animals. Beasts of burden are great force multipliers.
So, in truth, I think that colony placement has the largest affect on colony success. The closer to resources useful for industrialization, while still being able to feed the colony, the faster that industrialization can occur.
But putting the colony on a desert island with nothing but mango, coconuts and fish gives you a fishing colony -- and perhaps a bunch of hot chicks running around half naked.