Hi, because builder pattern on iOS is a bit hard to read (as said before, due to the deeply nested calls), I decided against it: id<AGPipe> myPipe = [[[[builder name:@"foo"] baseURL:someURL] type:@"REST"] build]; It could be done with some reflection usage, but that's an issue w/ ARC: id<AGPipe> myPipe = [[builder withName:@"foo" withBaseURL:url.....] build]; == Config object == I propose using a config object, passed to a code-block. More details, see this gist: https://gist.github.com/3979665 -M -- Matthias Wessendorf blog: http://matthiaswessendorf.wordpress.com/ sessions: http://www.slideshare.net/mwessendorf twitter: http://twitter.com/mwessendorf