It was a privilege for IRC-IMR to host a visit from Professor. Miguel J. Bagajewicz on 5th March, 2024. Dr. Bagajewicz is retired from the University of Oklahoma, where he was the Sam Wilson Professor of Chemical Engineering. He has a bachelor’s in chemical engineering from Argentina and a Master of Science and Ph.D. from the California Institute of Technology, USA. In Argentina, he was a member of the staff of the National Research Council and an associate professor at the University. He worked at Simulation Science (California), where among other duties he participated in the development of a data reconciliation software (Datacon), being responsible for one of its releases. While at Simsci, Dr. Bagajewicz participated in onsite training and problem-solving of data reconciliation as well as several other duties related to Simsci’s process simulator, Pro II. He is the author of several publications on data reconciliation and gross error detection as well as in instrumentation network design and upgrade. On this last subject, he is the author of two books that review the field and present the cost-optimal paradigm. In the area of sensor network design, he has developed one of the first cost models, has offered new definitions for software accuracy, has shown how to calculate the value of information, and has recently proposed a new paradigm in sensor network design consisting of maximizing an unconstrained objective (value-cost). In his second book, he reviews the old and new paradigms.