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WAITING WASTE

Also known as delay, waiting refers to the periods of inactivity that occur because a preceding activity didn’t deliver on time or finish completely. Waiting waste increases cycle time during which no value-added activity is performed.

MOTION WASTE

This term refers to the extra steps taken by people to accommodate inefficient process layout, defects, reprocessing, overproduction or excess inventory. Motion takes time and adds no value to the product or service. To move and add value is called work. To move and not add value is called motion.

OVER-PROCESSING WASTE

This term generally refers to unnecessary steps in operations, such as reprocessing, double-handling, added communication and double-checking which adds no value to the product or service. Over-processing is often inserted into a process as a result of dealing with defects, overproduction or excess inventory.

OVER PRODUCTION WASTE

Overproduction occurs when operations continue after they should have stopped.  It’s producing more than is needed, faster than needed or before it is needed. This results in product being produced in excess of what’s required, products being made too early, and excess inventory carrying costs.

TRANSPORTATION (or CONVEYANCE) WASTE

This is unnecessary motion or movement of products or materials that does not directly support immediate production, such as materials being transported from one jobsite to another or materials being transported from the jobsite back to the Building Partner. Ideally transport should be minimized for two reasons: It adds time to the process during which no value-added activity is being performed, and the material is exposed to handling damage.

INVENTORY WASTE

This refers to any supply (materials or goods) in excess of what is required to build the current homes under construction. Inventory includes raw materials, work-in-process and finished goods. Though not all inventory is unneccessary waste, excess inventory can quickly build-up and tie-up dollars and resources. All Inventory requires additional handling and space.

CORRECTION (or DEFECTS) WASTE

These are products, materials or services that do not meet expectation or conform to specification. Corrections and defects are anything not done correctly the first time and must be repaired, sorted, re-made or re-done, as well as materials which are scrapped due to defects.

© June 2010 Homebuilding Partners, Inc.   

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