Introduction. Skills for science processes are a part of scientific literacy and also are a very important component of science teaching. There are, nevertheless, not enough studies in Iberoamerica about these skills in secondary education. Objective. This is an exploratory study that aims to determine the familiarity and interest degrees of secondary education students on these skills. Materials and methods. A questionnaire was given to 144 Spanish secondary students, from five different education levels. In that questionnaire, their familiarity and interest degrees on the skills of the basic and integrated sciences are demanded. Results. The familiarity degree with the sciences processes is growing as the academic level is higher. Nevertheless, the interest degree reaches its maximum levels at the beginning and at the end of the secondary education. The U Mann-Whitney´s test reveals that there are not significant differences between the basic and the integrated skills. The 'chi square' test demonstrates a significant association between the familiarity degree and the academic level and between the interest degree and the academic level. Conclusions. The familiarity degree of secondary education students with the skills related to science processes is relatively good (except for three integrated skills) and is significantly better at the end of the secondary education. The interest degree is really high and is significantly higher at the beginning and at the end of the secondary education.