One working time or remuneration model does not fit every foot. The same applies to choosing the right way of planning and implementing a project.
Over the years we have been working with the right mix out of process know-how and know-how about working time. All this has to be seasoned with the right amount of software support. The mix is what counts - and the mix has to be tailored to each and every situation.
Even if a successful model has to be re-adjusted to a new situation after a few years - the experience of how to deal with the situation is still in the organization and makes it much more easy to deal with the change in a professional way.