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Variation
(undesired) Deviation or fluctuation in the process (or from the process mean) resulting from inputs and actions; it has a corrupting effect on the workflow. it is important to identify sources of variation and eliminate them in order to have a consistent workflow on the job.
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Causes of variation:
- a) common cause (internal): individual crew member performance, safe work practices, experience, etc.
- b) special cause (external): weather, equipment breakdown, delivery interruptions, design changes/errors.
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WIP definition
The amount of work in production at a given time.
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Throughput definition:
The amount of output (finished product) in a given amount of time (the real measure of speed in the system).
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Cycle time definition:
The time that it takes for material/product to cycle through the production system: from the time it enters to the time it leaves the production system.
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Capacity
...the maximum amount of work a production unit can accomplish with the provided tools and methods. Ultimately, there would be a 100% capacity.
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Buffer is
A mechanism to reduce the impact of variation on a construction operation. They only mitigate, not erase the cause for variation. There are 3 kinds of buffers: inventory, capacity & schedule.
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Workflow is
a progression of work within a trade or from one trade to another. Reducing workflow variation makes project outcomes more predictable.
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In order to start any work activity, we need 3 types of inputs:
- Directive
- Prerequisite work
- Resources
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Variability definition
is the ability to deviate/adjust creatively & productively due to variation
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Material buffer means
Stocking of critical material.
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What are resources?
Labor, equipment, material, and tools required to complete a certain activity.
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Schedule buffer definition:
Activities/work not on a critical path that can help combat schedule variation. Fill-in activities in case of lack of work.
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Capacity buffer means
maintain extra crew on hand in case workflow demands it.
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Throughput
The amount of output (finished product) in a given amount of time (the real measure of speed in the system).
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Directives are
set of instructions required to start the activity
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Execution failure definition
Any failure that stops a crew from completing their activity by the scheduled time
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Lowering the river is a metaphor for...
...reducing the buffers in order to expose problems (rocks in the river).
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What is Lean (definition)?
Set of ideas, practiced by individuals in the const industry, based on the pursuit of CImprovement aimed at minimizing cost and max value to stakeholders.
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TFV theory
Lauri Koskela 1992 States that CM involves the transformation of input into output, a flow of material/information, and management of the value important to customers
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