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For nearly 30 years Scheme lived without a standard module system. The consequences of this omission were the proliferation of dozens of incompatible module systems and neverending debates. The situation changed with the R6RS report: nowadays Scheme has an official module system, finally.

Unfortunately the official module system is not used by all Scheme implementations, and it is quite possible that some implementation will never support it. For instance Chicken, a major implementation, just released version 4, which includes a brand new module system not compatible with the R6RS system. You should be aware that the module system (and actually the whole of the R6RS standard) is controversial, and there are good reasons why it is so.