We did it very differently in our group 1. The developers of the old tool continued to work on it. 2. A new team took requirements from the old team and filtere

We did it very differently in our group 1. The developers of the old tool continued to work on it. 2. A new team took requirements from the old team and filtered to make them more meaningful 3. Designed a system architechture that would work with the targeted workflow 4. Designed a minimal version and ran it with a new branding next to the old one. 5. Reached feature parity with the old one and dumped it The important thing to note is that the new tool does not do everything the old tool does. The workflow is also different from the old one. However the customers loved the new one as it was simpler, faster and more robust to use.