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What is the difference between 発展、発達、and 開発?

According to my textbook, they all mean development. I know that they cannot be used interchangeably, but I don't know when to use each of them.

I know the kanji 開 means to open, so I'd assume 開発 is used when something new is developed. Is that correct?

However, I don't know the meanings of the other kanji to distinguish the difference.

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    開発 is usually (I assume not always) used in the context of software development. You may see it as ソフトウエア開発(Software Development)、システム開発(System Development)、プログラム開発(Program Development). The kanji 開 doesn't necessarily mean open in this context, lest it mean "open occurrence". Commented Apr 24, 2015 at 6:02
  • 開発 is development in general. It isn't limited to software. If you have a dictionary that will allow you to show it as a suffix, throw it in and look at the countless possibilities. Commented Apr 24, 2015 at 17:40

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開発 is clearly different from the other two. 開発 means creation, engineering, etc., and 開発する is transitive. コンピュータを開発する means to create/build/engineer computers. As you pointed out, 開発(する) can be used when something new is created.

発展 and 発達 share the similar meaning to a certain extent. コンピュータの発展 and コンピュータの発達 both refer to the advancement of the computer technology in general. Both of these are intransitive when followed by する (i.e. コンピュータが発達する, not *コンピュータを発達する)

The difference of 発展 and 発達 are:

  • 発達 is more like sophistication, reaching maturity, increasing complexity, etc., while 発展 is closer to prosperity. For example, 都市の発達 tend to refer to a maturation of infrastructure, economy, or the system of politics, while 都市の発展 tend to refer to an expansion of the territory, increase of the population, etc.
  • The development of a body/organ/tumor/etc is almost always 発達. 「子どもの成長と発達」「精神の発達」「イルカの脳は発達している」
  • Additionally, 発展 sometimes means "to change", "to evolve." 「事件に発展する (develop into an incident)」「発展問題 (non-straightforward/advanced problem in a textbook)」

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