The spelling of the term "expert system programmers" can be explained using the International Phonetic Alphabet (IPA). The first word, "expert," is pronounced as /ˈɛk.spɜrt/ with stress on the first syllable. The second word, "system," is pronounced as /ˈsɪs.təm/ with stress on the second syllable. The final word, "programmers," is pronounced as /ˈproʊ.ɡræ.mərz/ with stress on the second syllable. Understanding IPA can help with proper pronunciation and communication in technical fields, such as computer science.