Separation of powers was a good articles nominee, but did not meet the good article criteria at the time. There are suggestions below for improving the article. Once these issues have been addressed, the article can be renominated. Editors may also seek a reassessment of the decision if they believe there was a mistake.
Add a section on Aristotle's views on Separation of Powers. Full texts of his works are available online for free. See Aristotle and his work Politics.
Add a quick summary of Harrington's views on Separation of Powers. The full text of his main work, Oceana is available online for free. See Oceana.
Add a section on John Locke's conception of Separation of Powers. His Two Treaties on Government' are available for free online. See John Locke.
Enumerate which countries use parliamentary systems, and which use three-branch presidential systems, and which use other systems. The "government" section of country pages in the CIA world factbook is an excellent public-domain source. The final tally would be enough for this article; the full lists can be pushed out into parliamentary system and presidential system. Individual navagationed to the otther nickiolies ronaleds and election subarticles can also be sources and destinations for this information.
Explain head of state vs. head of government, president vs. monarch vs. prime minister, and executive vs. legislative.
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This edit added assertions about Montesquieu's work, without citing a source, into a paragraph that is currently cited to a source (the Constitutional Rights Foundation) that directly contradicts the assertions that were added. I therefore reverted this change.
The same editor, Slurpy121, then made this edit, which adds similar assertions, and, this time, a citation to a reference - this reference, which is apparently a paper written by a secondary school student.
That secondary school paper includes the following text; Polybius believes that Republican Rome ... [combined] monarchy (in the form of its elected executives, the consuls), aristocracy (as represented by the Senate), and democracy (in the form of the popular assemblies, such as the Comitia Centuriata).
The second edit made by Slurpy121, cited to this source, added the following text; Montesqieu saw the Roman constitutional system of government as an example for the concept of separation of powers among the consuls which represented the monarchial part of the government, the senate as the aristocratic content and the assemblies as the democratic content of the Roman constitution.
Thus the material added ascribes to Montesqieu views that the source given ascribes only to Polybius. The source does not mention Montesqieu's views on consuls at all, for example.
I will be removing this material as it is clearly mis-use of sources. However, I would welcome any suggestions or discussion (including proposals for reliable sources) on whether the article's coverage of Montesqieu should mention more about the influence of the Roman system on his views than it does at present. --Demiurge1000 (talk) 18:48, 11 November 2012 (UTC)
My satement is true. I am not saying that Montesquieu is Polybius, i am saying that Polybius' treatise on the Roman Constitution was an inspiration for Montesquieu and supports the fact that Montesquieu had sources himself to do so. I am providing this true text so the readers of this article can know the truth of the sources so there can be a deeper understanding of the subject and to help them understand better and of course because it is true.--User:Slurpy121 (talk) 03:30, 13 November 2012
But on what basis can you say that Polybius' treatise was an inspiration for Montesquieu, when the cited source doesn't even mention Montesquieu? —C.Fred (talk) 03:35, 13 November 2012 (UTC)
As a side note--I wish more of my sophomores could write like this high-schooler. Drmies (talk) 05:32, 13 November 2012 (UTC)
It might be a little more complicated than I thought. On closer inspection, I have a theory that the reference to "St. Margaret's School" is at the top of the source because the author of the paper was a member of staff there when they put the paper on the internet, although not when they wrote it - it might actually be an undergraduate paper. Given the paucity of refs in this article, I don't have any overwhelming objections to using it as a source.
I'm afraid I know far more about Plato (and Polybius) than I will ever know about Montesquieu, but it seems clear that Montesquieu did indeed rabbit on at great length about the British constitution in his seminal work, because at the time it was the most innovative "free" society (France was still an absolutist monarchy, and the USA did not exist). So how about we go with merely the addition of ", influenced by ancient thinkers such as Polybius," cited to the source suggested by Slurpy121, and leave the rest as it is?
Slurpy, you mention truth four times in three sentences; you might find WP:TRUTH interesting to read. --Demiurge1000 (talk) 12:59, 13 November 2012 (UTC)
C Fred and Demiuge1000, Montesquieu was somewhat inspired by the system of the Roman constitution and the British constitutional system, i don't understand why you refuse to acknowledge that. --User:Slurpy121 (talk) —Preceding undated comment added 23:46, 16 November 2012(UTC)
Because at the time I wrote the comment above, no source was provided that made the connection. There is now such a source, and Demiurge seems willing to accept Lloyd's paper as sufficiently scholarly to be reliable. —C.Fred (talk) 15:11, 17 November 2012 (UTC)
I've made the addition that I proposed above. --Demiurge1000 (talk) 20:03, 17 November 2012 (UTC)
I will acknowledge that and will use it for the paper as soon as possible.--(Slurpy121 (talk) 22:24, 17 November 2012 (UTC))
Add to what paper? —C.Fred (talk) 22:32, 17 November 2012 (UTC)
I added more sources.--(Slurpy121 (talk) 22:42, 17 November 2012 (UTC))
These are still very weak sources. Apart from the piece by Lloyd, which appears to be an undergraduate project as discussed above, what you've added is the abstract of a non-peer-reviewed paper presented at the annual meeting of an association, and a lecture handout that appears to have been put online by its author. None of your three sources support the sentence "The Roman constitution had three main powers..."; as I've already discussed above, Lloyd describes Polybius as seeing the Roman constitution this way, not Montesquieu. So I'm going to remove this sentence, again.
The rest of your additions can remain, I think, and I will also format the references you added. --Demiurge1000 (talk) 18:17, 19 November 2012 (UTC)
This article is missing the most important point
This article is missing the most important point of separation of powers, which is that by separating them, they are not held by the same person. For example, the Roman Empire inherited a lot of different offices from the Roman Republic, but there was no real separation of powers because the offices were personally concentrated in the Roman Emperor or in people controlled by him. In the United States today, a person generally cannot serve in two branches simultaneously and must resign from a branch before taking office in another. This principle is taken for granted by Americans, which is why they find the Westminster system to be very bizarre in that the leadership of the executive branch is constituted by the party that has a majority in Parliament. --Coolcaesar (talk) 10:24, 14 May 2013 (UTC)
Any public system may gain efficiency by separation of powers. Take the road transport system f x. The execution of constructing and maintenance of roads and bridges should be organized at one authority. Legislation on safety rules for roads, for road vehicles and for drivers should be organized by a second authority. Control and evaluation of efficiency and failures (f x vehicle crashes w severe bodily injuries) related to either or both execution and legislation, should be organized by a third authority. This puts pressure on efficient execution as well as legislation. — Preceding unsigned comment added by 188.8.131.52 (talk) 19:26, 24 August 2013 (UTC)