According to one embodiment of the present invention, a software architecture encoded on a computer readable medium is disclosed. The software architecture can be utilized for developing in-vehicle software applications for installation and execution on an in-vehicle computer system. The software architecture includes a number of vehicle application program interfaces (APIs) for accessing vehicles systems or data and for developing in-vehicle software applications; and a number of policy restrictions underlying the vehicle APIs for restricting the level of access to vehicle systems and data while the in-vehicle software application is being developed.