03 Oct

Control Charts

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Control Charts: are used for determining stability of a process. Important
terms are:

USL – Upper Specification Limit
LSL – Lower Specification Limit
UCL – Upper Control Limit
LCL – Lower Control Limit

First two are set by customer and last two are normally (+-) 3 Sigma.
Normally used to track repititive activities, sometimes they are also used
to monitor

cost and schedule variances, volume and frequency of scope changes.

A process is out of control when seven consecutive data points are above or
below the mean.

19 Sep

Ishikawa – Cause and Effect diagrams

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These diagrams are also called as Cause and Effect diagrams or Fishbone diagrams as they resemble a Fishbone. These are also used in risk analysis.Here the causes are grouped into categories, this helps in identifying the root cause of the problem.

fishbone

The categories may include:

People
Method
Machines
Materials
Measurements
Environment

For manufacturing industry- 8 Ms are used.
in Service industry – 8 Ps are used.

Note: A root cause can be uncovered by asking why or how continuously. This is a common technique.

For Related question, visit this LINK


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