In the present study the alternative conceptions were investigated about the reading of the cartesian graphs that represent physical movement. In special, the attention focuses in the conceptions relative to the average speed, instantaneous speed and the trajectory of bodies in movement that come off the reading of Cartesian graphs of coordinates time-distance. The exploration was made on the base of a designed questionnaire specifically that was applied to students and professors, participated to 80 students of Secondary degree, 100 of Preparatory degree of and 15 university students; on the part of the professors they participated: 13 of secondary and 40 professors of physics of the preparatory level. After to have studied the movement in physics, normally the professors hope that their students can read the graphics and obtain data of them, nevertheless in this investigation are several evidences of which the interpretations who do the students are not those who share the experts and texts. One would think that the things are better in the professors, but the results that are exposed here do not seem to confirm this hypothesis.
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