Here is an insightful article into the development process for creating Apple software. Macformat magazine interviews the folks from Equinux. It's always interesting to see the methodologies being employed by other software firms. The interview does a good job of outlining the tedious but rewarding process. Incidentally, Equinux develops in a very similar style as thinkenhaus.

"One of the best things about the Mac is the community of dedicated software developers that create high quality software. But what is involved in the process that goes into planning and developing new software for the Mac? To find out, MacFormat magazine spoke to the following folks from equinux, the firm behinds apps including iSale, CoverScout and SongGenie."

http://www.techradar.com/news/computing/apple/before-you-buy-how-apple-software-is-born-601111