Some Quick Questions

In order to test my assumptions regarding the digital habits of New Zealand architecture practices I put together a few questions and informally emailed a number of my friends. Thanks to the power of the forward button I got many more responses than I hoped. Below is the five quick questions I asked with the intention of justifying my own position on the subject matter:

1. When dealing with design variations (at a conceptual or development level) do you work on the same file or create a new file and keep the other versions for reference?