What is the suitable SPC criteria & control chart type

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Dear Friends,

Request to clarify following doubts.

1) Is SPC aplicable only for fixed lots? If so why SAP has put this limitation? Becasue most of the sampling procedures are not fixed. Is there a way around to use SPC for all sampling procedures.

2) What is the suitable SPC criteria & control chart type for the following characteristics in standard?

a) upper limit, lower limit, sampling procedure, single result, required characteristic, fixed scope,

sampling procedure

Sampling type = using sampling scheme with AQL

Valuation mode = variable inspection S method (two limits)

b) > lower limit, sampling procedure, single result, required characteristic, fixed scope,

sampling procedure

Sampling type = using sampling scheme with AQL

Valuation mode = variable inspection S method (one limits)

b) qualitative characteristic, sampling procedure, summurised recording, required characteristic, fixed scope,

sampling procedure

Sampling type = percetange sample

Valuation mode = attributive inspection nonconfirming units

Regards