The experiments have compiled HPC-related documents, including the summary of a joint meeting on this subject. This document intends to extract the commonalities between experiments with the aim of developing a joint roadmap and strategy for enabling the exploitation of HPC resources. To develop common approaches between experiments and HPC sites, a foundation and understanding of the problems is needed. This is built on a summary of technical challenges, described in section 2. They are broken into two main categories: computing resource challenges and software and architecture challenges. Computing resource challenges describe issues related to operations, facility access, provisioning, and monitoring; while software and architecture challenges are related to adapting HEP applications to make effective use of alternative architectures often found on HPC. In order to explore potential solutions a number of pilot demonstrators are proposed in section 3 below.