I think you'll find people working in a variety of forms right now Elliot. The marketplace is still new enough that customary protocols haven't really developed. My personal preference is to work on an hourly basis because there are just so many unknowns going into an EBOM project that can affect the cost for the client (either positively or negatively), particularly before you undertake the feasibility study phase. But plenty of folks use a flat fee and find it more effective.