Welcome to the 2nd annual workshop on parallelism in mobile platforms(PRISM-2)! Mobile platforms are an increasingly important computing environment for many people and businesses. It is both historic and symbolic that PCs were outsold by smartphones in 2011. Rapid advances in wireless network technology like 4G LTE and multicore based mobile architectures continue to fuel the development of exciting new applications on mobile platforms, which, in turn, attract elevated attention to the mobile platforms. While performance and power are two most critical design goals for computing platforms across the board today, mobile platforms are perhaps the most sensitive to the right balancing of the two design goals due to their battery powered nature. Furthermore, mobile platforms are subject to other unique design constraints like: very limited form-factor, no active cooling, and constantly changing external environment. Typically, environment changes are continuously "sensed" for contextualizing a given system. One of the most important principles in designing today's computing systems is to exploit parallelism. Mobile platforms are no exception and we find increasingly more instances of the use of parallelism in them. At the hardware level, there are: multiple processor cores, GPGPU, accelerators, multiple banks of memory, multiple channels to non-volatile memory chips, and multiple radios, to name a few. At the software level, parallel and concurrent threading techniques are commonly employed to improve responsiveness and throughput in the OS and applications alike. We anticipate that future mobile platforms will make more extensive and creative use of parallelism. This workshop focuses on how parallelism is, and can be, utilized in hardware, software and their interaction in order to improve the user experiences with mobile platforms.