Recently, researchers who study 'dynamic assessment' refer to not only 'static testing' but also 'performance assessment' and 'portfolio assessment', to contrast with dynamic assessment. In this paper, I clarified the tendencies around educational assessment. In United States of America, although standardized tests are spread under NCLB Act, there are tendencies that instructional functions of educational assessment are emphasized and informative feedbacks are considered. And 'authentic assessment' that based on constructivism, are prevailed under the condition. In terms of dynamic assessment, focusing on portfolio conference, I analyzed the interaction while assessment occurred.