This document discusses integrating constructability reviews with lean construction and work planning. It describes how constructability must be considered early in the project life cycle during planning, design, procurement, and mobilization phases. Conducting detailed reviews of designs, models, specifications, and construction processes allows constructability specialists to identify issues like errors, unclear specifications, complex features, and risks to cost and schedule. The document also outlines key aspects of lean construction including maximizing value and reducing waste. Developing well-planned weekly work schedules using lean techniques allows for production scheduling, work packaging, and monitoring percentage of planned work completed.