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S Chart
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Sample Standard Deviation Chart – used when the subgroups are of unequal sizes in replacement of the R Chart.
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Scorecard
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Collection of Metrics on one sheet. Red, yellow and green indicators are utilized for quick and standardize reference.
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SDM
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Statistical Design Methodology – where a tolerance is based on probabilities and definitions of risk rather than worst case scenarios.
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Sensei
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One who provides information; a teacher, instructor, or rabbi.
An outside master or teacher that assists in implementing Lean practices
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Setup Time
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The time required to change a process over from one product or service type to the next good product or service type.
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Setup Time Reduction
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A process of reducing setup time by identifying and reducing two types of time:
1. Internal Time: Activity that can be done only when the machine or process is not actively engaged in production. Move as much setup time from internal to external.
2. External Time: Activity that can be performed concurrently with the machine or process performing production duties.
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SEV
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Severity – with regards to the failure effect of an FMEA
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Shift
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A change in of an otherwise stable or steady statistic
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Sigma
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Greek letter that represents Standard Deviation. Also a way of managing a business to collect and use data to “act on fact” in management decisions.
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Single Minute Exchange of Dies (SMED)
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Changing a die or conducting a model changeover in a less than 10 minutes. Accomplished through separation of internal and external elements as well as standardizing and practicing the changeover process. Ultimate goal of changeover times less than or equal to takt time. Also see Setup Time Reduction
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Single Piece Flow
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See Continuous Flow Production
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SMART
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Specific, Measurable, Achievable, Relevant, Time Bound – used to define a process improvement projects.
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SOP
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Standard Operating Procedure – See Standard Work.
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SPACER
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Safety, Purpose, Agenda, Code of conduct, Expectations, Roles – used to set up the tone of a meeting.
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Spaghetti Diagram
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Map showing movement of people, product or materials and can show total distance traveled. Can show multiple people.
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SPC - Statistical Process Control
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Statistical charts based on numerical (variable) measurements that become a picture of the process over time.
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Special Cause Variation
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Variation caused by known factors that result in a non-random distribution of output. Special cause variation is a shift in output caused by a specific factor (see 6M’s) such as environmental conditions or process input parameters. It can be accounted for directly and potentially removed. Also known as “Assignable Variation”.
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Stability
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Stability represents variation due to elapsed time. It is the difference between an individual's measurements taken of the same parts after an extended period of time using the same techniques.
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Standard
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A prescribed documented method or process that is sustainable, repeatable and predictable. Similar to a rule or law. These involve comparison with accepted norms, such as are set by regulatory bodies.
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Standard Deviation
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Positive square root of the variance – a measure of the dispersion about the mean of a data set. Defined by  for a sample.
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Standard Work
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An optimum combination of people, machines (mechanical resources) and material for each task or activity of a process. See standardization.
A precise description of each work activity specifying cycle time, takt time, the work sequence of specific tasks, and the minimum inventory of parts on hand needed to conduct the activity
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Standard Work in Process
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The minimum amount of material or a given product, which must be in process at any, time to insure proper flow of the operation
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Standardization
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Documenting and using the best known method of completing a task or activity. Standardization leads to reduced variation leading to more consistent performance in respect to quality, cost and delivery.
The system of documenting and updating procedures to make sure everyone knows clearly and simply what is expected of them.
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STRAP
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Strategic planning usually 3 to 5 year forward looking.
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Strategic Planning
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Sets the direction for long-term business survival. See Hoshin Planning
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Stratification
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Unnaturally small fluctuations on a control chart with an absence of points near the control limits (sometimes termed white space due to lack of points)
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Sub-Optimization
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A condition where gains made in one activity are offset by losses in another activity or activities, created by the same actions crating gains in the first activity.
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Supplier Partnership
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An approach to business that involves close cooperation between the supplier and the customer. It provides benefits and responsibilities that each party must recognize and work together to realize
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SWOT Analysis
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An analysis looking at a businesses strengths, weaknesses, opportunities and threats.
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System Kaizen
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Improvement aimed at an entire value stream
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