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The Challenge Activity Guides Essential Elements Career Conversations Building the Future STEM Workforce The Challenge What is the Challenge. The Challenge is a teambased competition for 5th through 8thgrade students that builds interest and excitement among students to continue science and STEMrelated education throughout high school skilled trades college and into the workforce. CEF supplies educators and parents with all the necessary resources to participate in the Challenge including online support study materials and tips on stepbystep implementation. Read More Activity Guides Presented by Brenntag Activity Guides use common inexpensive items so educators can provide handson learning for K8 students to explore foundational science concepts.