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Problem posing is well known as an effective activity to learn problem-solving methods.Although the activity is considered to contribute to understanding of the structure of problems,it is not clear how learners could understand it through the activity.This paper proposes detection of important learners actions by tracing problem-posing activity sequences.The sequences are considered to represent thinking process of learners and reflect their understanding and misunderstanding about the structure of problems.This paper expects visualizations of the sequences to be helpful to infer learners bottlenecks in thinking and misunderstanding behind them.The goal of this paper is to make it possible to analyze problem-posing activity sequence for enhancing the effectiveness in learning.As an example,this paper proposes detection of "trap-state" that is a combination of simple sentences many learners tend to make in problem-posing assignments.