
In the modern world, there are two prevailing schools of television production. In most countries, especially in Europe but also frequently in Japan, the aim is to make a short series that only has an initial run of six to ten episodes. If a particular program proves popular (alliteration not intended) it is often renewed for a somewhat longer second series, then maybe a third and so on until the show dies. This tends to result in shows that either disappear before they really capture their audience, like BBC's Life on Mars, or shows that go on forever, like Absolutely Fabulous to take another example from the BBC.
The other school of thought, this one primarily practiced in America, is to launch a show with the goal of a seven-season run. This is at once ridiculously ambitious and horribly prone to creativity-squashing. When it works, it's wonderful.
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