A new list of scenarios which are practical to develop and desirable from a marketing perspective should emerge. Conduct a full lifecycle development process Proceed to develop Release 3.0 of the product using a full lifecycle user centered design approach such as that developed by Deborah Mayhew or Larry Constantine. A key issue to making the two track approach work, is the assignment of resources over time. It is essential for the management to realize that the 2nd track requires only a few staff in the early stages. Perhaps as few as 3 people can make significant progress on track 2.
Additional resources are always helpful, if the requirement is likely to be large.
However, a minimum team of three should suffice to gather requirements from stakeholders, build the lifestyle snapshots, develop initial prototypes and then run a series of early lifecycle usability studies, iterating the design. Meanwhile, another small team of developers with a sufficient critical mass, perhaps as few as 6 or 8 can build the first release for the tactical track. At the point when Release 1.0 hits the streets, suddenly more man power is required. A full development team is needed to develop 2.0 and perhaps maintain 1.x. Meanwhile, a full analysis team is required to write the requirements for 3.0.