Sodality and Modality

When I first heard these two terms - sodality and modality - I had a bit of trouble understanding the concepts, much less keeping in line which was which. [I still can't quite keep it in line.]

Sam Metcalf has a good summary of:
sodalities - apostolic structures
modalities - local church structures

If you are a frequent reader, his summary would probably interest you too.

I understand that both are distinctly different, are needed and that both complement each other. I just wonder if a group of people can be both at the same time. Is SPACE a sodality or a modality? Which would I prefer? And does it matter and why or why not?

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