No knowledge of electronics was needed to assemble a Heathkit. The assembly process did not teach much about electronics, but provided a great deal of what could have been called "electronics literacy", such as the ability to identify tube pin numbers or read a resistor color code. Many hobbyists began by assembling Heathkits, became familiar with the appearance of components like capacitors, transformers, resistors, and tubes, and were motivated to find out just what these components actually did. For those builders who had a deeper knowledge of electronics (or for those who wanted to be able to troubleshoot/repair the product in the future), the assembly manuals usually included a detailed "Theory of Operation" chapter, which explained the functioning of the kit's circuitry, section by section. Heath developed a relationship with electronics correspondence schools (e.g., NRI and Bell & Howell), and supplied electronic kits to be assembled as part of courses, with the schools basing their texts and lessons around the kit.