The document discusses reproducibility in computer systems research. It defines reproducibility as the ability for an entire experiment or study to be reproduced by either the original researcher or someone else working independently. The document then examines 613 papers from various conferences and journals to determine how reproducible their results were. It found that only 9.8% of the papers were fully reproducible, while 26% were not reproducible at all due to factors like unavailable source code or data. The document concludes by providing recommendations to improve reproducibility, such as requiring source code submission with papers and avoiding excuses for not sharing materials.