The Outstanding Paper Award Subcommittee has assessed the 93 papers published in 2007 (vol. 33), and the editorial board finally selected the following two papers for Kagaku Kogaku Ronbunshu Paper Awards of 2007: "An Investigation of Primary Particle Growth and Aggregate Formation of Soot Using a Numerical Model Considering the Sintering of Primary Particles," and "A Method for Setting Buffer Times between Batches with Uncertain Processing Times."