Connect students directly to the concept in a personal way. Capture students' attention by initiating a group problem-solving activity before delivery of instruction. Begin with a situation that is familiar to students and builds on what they already know. Construct a learning experience that allows diverse and personal student responses. Facilitate the work of cooperative teams of students.

Students are shown a clip from the video Crossing Delancy.

Objective: To allow the students to become intrigued with a chemical catalyst or enzyme by an initial introduction which compares it to a matchmaker in the movies (or real life).

Activity: The students are shown a clip from the movie Crossing Delancy which is currently available in video rental stores. The clip is about twenty minutes into the film and features an old-fashioned matchmaker who brings a "nice girl" and a "good boy" together. They meet at a kitchen table. While the couple interact, the matchmaker (and the girl's grandmother) leave and go into the kitchen. The connection with enzymes works well, because two substrates (the girl and boy) are brought together so that they can react. They may have gotten together eventually, but it may have taken seventy years. The kitchen table is the active site and the matchmaker leaves and does not become part of the final reaction. The video is timely and currently available, but if it is impossible or impractical to show, this is also the perfect time for the teacher to become storyteller and make up a fascinating five minute story about a kind, nosy neighbor who brings two young people together.

Assessment: Attentiveness of the students during the movie clip or story.