This document outlines an action plan for improving traditional "cookbook" science labs by making them more inquiry-based. It proposes using Inquiry-Based Integrated Instructional Units (I3U) that are designed around clear learning outcomes, sequenced into classroom instruction, and integrate the learning of science content with the process of science through student reflection and discussion. The I3U model focuses on asking challenging questions, teaching critical thinking skills, and having students apply concepts to new situations by working with peers. Teachers can use this approach to change from lecture-based teaching to more student-centered labs that develop scientific thinking.