This document discusses the theory and methods of educational design and interactions according to the System of Objectives and Educational Functions (SOFE). It explains the key concepts in SOFE including educational objectives, fundamental objectives, general objectives, and specific objectives. The document outlines the characteristics and relationships between these different types of objectives. It also discusses how SOFE aims to personalize education by considering both common objectives for all students as well as individual objectives for each student. The overall purpose of SOFE is to provide a coordinated and unified framework for educational objectives across different subject areas and levels of schooling.