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84 The PCB Magazine • April 2017 Table 1 summarizes the applicable requirements and certification options and combinations for the three supply chain roles by trust element. Individual companies may seek trust accredi- tation (bottom up) or, alternatively, the Prime DoD contractor can contractually impose PrCB EA developed accreditation requirements on their in-house or sub-tier contractors requiring trust accreditation (top down). Accreditation Process Bottom Up Individual contractors may become trust accredited, which is referred to as the "bottom up" process as illustrated in Figure 2. The con- tractor (applicant) may initiate an application for PrCB Trust Accreditation to the accredita- tion authority. The application is evaluated and EXECUTIVE AGENT FOR PCB AND ELECTRONIC INTERCONNECT TECHNOLOGY PRCB TRUST ACCREDITATION Table 1: Alloy temperature details.