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TRB's second Strategic Highway Research Program (SHRP 2) Report S2-R06D-RW-4: Nondestructive Testing to Identify Delaminations Between HMA Layers, Volume 4 describes the uncontrolled evaluations used in the development of nondestructive testing (NDT) techniques capable of detecting and quantifying delaminations in HMA pavements. SHRP 2 Report S2-R06D-RW-2 was developed as part of SHRP 2 Renewal Project R06D, which generated a sizable amount of documentation regarding the findings of evaluations and equipment development. The report for SHRP 2 Renewal Project R06D is therefore divided into five volumes. Volume 1 is a comprehensive summary of the study. Volumes 2 through 5 provide more detailed technical information and are web-only. The topics covered in other volumes are listed below. Volume 2: Theoretical Models Volume 3: Controlled Evaluation Reports Volume 5: Field Core Verification Renewal Project R06D also produced a Phase3 Report to document guidelines for use of ground penetrating radar and mechanical wave nondestructive technologies to detect delamination between asphalt pavement layers.