If you are producing this app for your company and there are other stakeholders involved then, once the following things are in place:
- your app strategy (eg. iPhone only, special iPad edition and other platforms later?);
- your spec;
- designs/mock-ups (if you have some); and
- your proposed breakdown of responsibilities are clear;
the next thing you should do is circulate the plans (email is good) and make sure that you get buy-in from everyone (it might seem over the top but written confirmation can ensure an easier life later).This may include:
- Your boss
- Your MD
- Your development team
- Your design team
- Marketing
- Editorial
- Sales
- Your sponsors
Verbal agreements are quickly forgotten or remembered differently by each person involved. If you are managing the project it is not too much to ask for formal buy-in from people, so do it.