Librería Samer Atenea
Kálamo Books
Librería Elías (Asturias)
Librería Kolima (Madrid)
Librería Proteo (Málaga)
With the advent of desktop publishing systems and user-friendly computer software, there is an increasing trend for educators and trainers to produce their own instructional material. This study provides guidelines for the design of basic, sound and unconfusing instructional diagrams.