The purpose of the study is to bring in the fourth part of diachronic conversation on instructional design with Robert Gagné and David Merrill to trancripts. This conversation was hosted by Utah State University, in the United States of America, in July 10, 1989. Throughout the history of instructional design, these two scientists are considered as the pioneers of the field and in these sessions, they summarize and compare their studies.

The purpose of the study is to bring in the first part of diachronic conversation on instructional design with Robert Gagné and David Merrill to transcripts. This conversation was hosted by Utah State University, in the United States of America, in July 10, 1989. Throughout the history of instructional design, these two scientists are considered as the pioneers of the field and in these sessions, they summarize and compare their studies. In the first session, Gagné and Merrill represent their theories from their own perspectives.

The purpose of the study is to bring in the third part of diachronic conversation on instructional design with Robert Gagné and David Merrill to trancripts. This conversation was hosted by Utah State University, in the United States of America, in July 10, 1989. Throughout the history of instructional design, these two scientists are considered as the pioneers of the field and in these sessions, they summarize and compare their studies. In the third session, Gagné and Merrill represent their theories from their own perspectives.

The purpose of the study is to bring in the second part of diachronic conversation on instructional design with Robert Gagné and David Merrill to transcripts. This conversation was hosted by Utah State University, in the United States of America, in July 10, 1989. Throughout the history of instructional design, these two scientists are considered as the pioneers of the field and in these sessions, they summarize and compare their studies.

The purpose of the study is to bring in the fourth part of diachronic conversation on instructional design with Robert Gagné and David Merrill to trancripts. This conversation was hosted by Utah State University, in the United States of America, in July 10, 1989. Throughout the history of instructional design, these two scientists are considered as the pioneers of the field and in these sessions, they summarize and compare their studies.

There is nowadays a lot of interest in the field of Instructional Design. The focus is still on theories and methodology of Instructional System Design (ISD), which are the fundamentals of the field and are absolutely important for its application. However, most professionals are involved in the daily practice of instructional design (ID). The practice of instructional design has a slightly different approach, which tend not to follow strictly the linearity of many ID Models that have been created over the past thirty years. Success in applying the ID methodology lies on a systemic validation and revision of all phases performed along the process of developing instruction. Another element to be considered in the practice of ID, aiming effectiveness and high quality results, is the synergy of all components and the team, which will be acquired by fully knowledge of the process by all.