I would say, in this context, that "workplace" would be the most natural choice.

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Over 25 million hits for "in the workplace". See if you can narrow the search down to your context, perhaps, but after a good few years in HR and Planning, this is what I would use, from my experience.

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Note added at 9 mins (2009-03-13 12:57:46 GMT)
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I also got 14,000 hits for "psychology in the workplace", which perhaps moves more towards your context specifically. Google isn´t the be all and end all, but it just demonstrates how common and natural this term would be for this kind of text.

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Note added at 2 hrs (2009-03-13 15:08:14 GMT)
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Or "work environment", as above... :)