extract_from_--_s-pbse_content_inputs_for_incose_reference_ecosystem_v1.2.11.pdf
See also Patterns Working Group Slides from IS2017, for work with PLE before and at IS2017.
modeling_model_vvuq_and_model_use--overview_levels_v1.4.2_--_ansi_d_fmt.pdf
iw2016_joint_session--ple_wg_and_mbse_patterns_wg_v1.5.2.pdf