The purpose of this study is to develop a new reading method for foreign researchers. Our plan was to achieve the following three objectives: 1) the analysis of the reading activities of the native Japanese speaker under conditions with signaling and without; 2) the analysis of the reading activities of the non-native speaker under conditions of signaling and with a knowledge of technical terms; and 3) the implementation of a computer assisted technical reading system which applied signaling theory. In Part I of this paper, we describe the results of the first of the three objectives. An experiment of 2 x 6 design was conducted using college students who are native speakers of Japanese. Two conditions were designed into the experiments, the first concerned with the types of signaling present in the passage, and the second dealing with whether the passage was expository in nature or scientific and technical. As a result, it was found that signaling which enhances text structure has a content promoting effect in the recall of scientific and technical passages, in addition to a structuring effect. The findings of this research are that signaling may be categorized into two types: structural signaling (S-signaling) and notional signaling (N-signaling). This has led us to expand the definition of signaling as follows: Signaling consists of not only structurally redundant elements, but also of notional cues for organizing target texts.