Economical formwork is probably the most important single factor on high-rise work. Why? Because the cost of forming per se can be the major cost factor of cast in place concrete. It is common knowledge that the formwork cost is frequently more than that for the concrete, sometimes even when the cost of reinforcing steel is included with that of the concrete. It is thus obvious that savings in formwork costs can be a major part of savings in total job costs. But the fact that formwork accounts for a large part of the total job cost is not the only reason. Concrete and reinforcing steel costs, under normal conditions, are fairly constant; the cost of forming materials can be determined ahead of time. The cost of forming per se depends on the ingenuity, efficiency and job planning of the contractor. Proper selection of equipment and system are of major importance- and how the equipment is used is probably the deciding factor in achieving maximum economy. Here are a few rules for proper planning and use of equipment to improve that cost picture. Standardize wherever possible on dimensions for each floor. Savings in concrete and steel by using different size forming equipment on each floor may not justify the waste in forms costs. Labor required to alter formwork dimensions is also very costly. Maintain uniform height for as many floors as possible. Vary structural materials such as reinforcing steel rather than change the formwork. Set up a reuse cycle for keeping all equipment in use while at the same time complying with specifications requirements regarding the length of time forms and shoring must remain in place. After a system has been selected, layouts of the different floors should be prepared and the cycle set up for setting, casting, and stripping.