What term do developmentalists use to refer to the knowledge and experience in a specific domain?

Name: What term do developmentalists use to refer to the knowledge and experience in a specific domain?
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Developmentalists use the term expertise to refer to the knowledge and experience in a specific domain. Expertise refers to the ability to perform well in a particular field due to extensive experience and knowledge in that field.

What Term Do Developmentalists Use to Refer to the Knowledge