41 Developing training systems and learning methodologies for others; Education services, namely, providing career re-training classes, seminars and workshops in the fields of construction, maintenance, science, technology, and engineering; Educational services, namely, conducting classes, seminars, workshops and field trips in the fields of construction, maintenance, science, technology, and engineering and distribution of training materials in connection therewith; Educational services, namely, conducting classes, seminars, workshops and field trips in the field of construction, maintenance, science, technology, and engineering and distribution of training material in connection therewith; Educational services, namely, providing training of construction, maintenance, science, technology, and engineering professionals for certification in the field of heating and air conditioning, EPA 608 and OSHA 10