Hoi,
When you use Skype, this is true for several of the other VOIP clients on offer as well, you will find that some allow for calling to landlines in many countries. The rates are a vast improvement on what you pay with POTS. For some countries there are VOIP services that provide a gratis service ..

The second issue you raise; insistence on only foreign people who VOIP as a bias.. even if this is a bias, it is not of the same magnitude as US residents only. When it is considered difficult to send a voucher abroad, you can give people some "Skype out" credit in stead ...

Please explain why the selection of only Skype/VOIP users would be such a bad thing.

Thanks,
      GerardM

http://www.voipbuster.com/nl/index.html
http://skype.com/intl/nl/products/

On 3/22/07, Dag Asheim < dash@linpro.no> wrote:
GerardM <gerard.meijssen@gmail.com > writes:

> Hoi,
> Use skype if international phone call charges are an issue. Many
> people working on Wikipedia (and other wikis) use it intensively ..

I am sympatethic towards using Skype (or equivalent more open
VoIP-standards) in general, but I'm afraid that setting Skype
communication as a requirement for participation for interviewing will
skew the respondents in much the same way that only interviewing US
residents would.

--
Dag Asheim
Linpro AS


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