Classifications of control charts are depending on the type of data:

1.Variables data

• A characteristic measured on a continuous scale resulting in a numerical value
• Examples: Void Size, Bond Pull Strength, Coplanarity, Ball Height, etc.

2.Attributes data

• A characteristic measured by # of conforming & non-conforming to a specification.  Output is classified as pass/fail or accept/reject.
• E.g. Broken Wire, Lifted Bond, FM, Chipping, Bent Lead,  etc.
• Can be expressed in terms of fraction, percentage, count or DPM

Control Charts For Variables

Control Charts For Variables

Control Charts For Attributes

Control Charts For Attributes