The Programme for the International Assessment of Adult Competencies (PIAAC) has been planned as an ongoing program of assessment. The first cycle of the assessment has involved two "rounds." The first round, which is covered by this report, took place over the period of January 2008-October 2013. The main features of the first cycle of PIAAC are: (1) Skills assessed; (2) Other information on skills; (3) Test delivery; and (4) Adaptive testing. The following contents are included in this report: Section 1: Assessment and Instrument Design: (1) Assessment Design (Irwin Kirsch and Kentaro Yamamoto); (2) The Development of the PIAAC Cognitive Instruments (Mary Louise Lennon and Claudia Tamassia); The Development of the PIAAC Background Questionnaires (Jim Allen, Rolf van der Velden, Susanne Helmschrott, Silke Martin, Natascha Massing, Beatrice Rammstedt, Anouk Zabal, and Matthias von Davier); and (4) Translation, Adaptation, and Verification of Test and Survey Materials (Andrea Ferrari, Laura Wayrynen, Dorothée Behr and Anouk Zabal). Section 2: Platform Development: (5) Development of the Cognitive Items (Britta Upsing, Frank Goldhammer, Maya Schnitzler, Robert Baumann, Roland Johannes, Ingo Barkow and Heiko Rölke, Isabelle Jars, Thibaud Latour, Patrick Plichart, Raynald Jadoul, Christopher Henry, and Mike Wagner; (6) Development of Technical Support Tools (Britta Upsing, Frank Goldhammer, Maya Schnitzler, Robert Baumann, Roland Johannes, Ingo Barkow, Heiko Rölke, Isabelle Jars, Thibaud Latour, Patrick Plichart, Raynald Jadoul, Christopher Henry, and Mike Wagner; (7) Development of the CAPI Questionnaire Software (Thibaud Latour, Raynald Jadoul, and Mike Wagner); (8) Development of the Integrated Computer Platform (Britta Upsing, Frank Goldhammer, Maya Schnitzler, Robert Baumann, Roland Johannes, Ingo Barkow, Heiko Rölke, Isabelle Jars, Thibaud Latour, Patrick Plichart, Raynald Jadoul, Christopher Henry, and Mike Wagner); (9) The TAO platform (Raynald Jadoul, Patrick Plichart, Jérôme Bogaerts, Christophe Henry, Thibaud Latour, and Henri Tudor). Section 3: Field Operations and Quality Control: (10) Field operations (Pat Montalvan and Michael Lemay); (11) Quality Control Monitoring Activities (Pat Montalvan and Michael Lemay); (12) Scoring Reliability Studies Claudia Tamassia, Mary Louise Lennon and Kentaro Yamamoto); (13) Data Management Procedures (Ralph Carstens and Tim Daniel). Section 4: Sampling and Weighting: (14) Sampling design (Leyla Mohadjer, Tom Krenzke and Wendy Van de Kerchove); (15) Survey Weighting and Variance Estimation Leyla Mohadjer, Tom Krenzke and Wendy Van de Kerchove); (16) Indicators of the Quality of the Sample Data (Leyla Mohadjer, Tom Krenzke and Wendy Van de Kerchove). Section 5: Data Analysis and Data Products: (17) Scaling PIAAC Cognitive Data (Kentaro Yamamoto, Lale Khorramdel and Matthias von Davier); (18) Scaling Outcomes (Kentaro Yamamoto, Lale Khorramdel and Matthias von Davier); (19) Proficiency Scale Construction (Kentaro Yamamoto, Lale Khorramdel and Matthias von Davier); (20) Creating Simple and Complex Derived Variables and Validation of Background Questionnaire Data (Matthias von Davier, Jonathan Weeks, Henry Chen,Jim Allen and Rolf van der Velden); (21) PIAAC Proficiency Scales Claudia Tamassia and Mary Louise Lennon); (22) Generating Results for PIAAC (Alfred Rogers and John Barone); (23) International Database and Data Analysis Tools (Ralph Carstens, Tim Daniel, and Eugenio Gonzalez). The following are appended: (1) PIAAC main study item pool characteristics; (2) Contrast coding used in conditioning; (3) Design effect tables; (4) Changes to questionnaire items from IALS to PIAAC; (5) Mapping of ISCED levels to years of schooling; (6) PIAAC Consortium, staff, Expert Groups, National Project Managers and consultants; and (7) Data Adjudication in PIAAC (PIAAC Consortium and William Thorn, OECD). (Individual chapters contain references.)