This thesis is concerned with the problem of selecting continuous sampling plans and of constructing an operating system of rules for stopping inspection.
First, a method of selecting Dodge-type continuous sampling plans with prescribed AFI curve is proposed; a sampling plan is designed so that its AFI curve passes through two designated points. AOQL contour lines are also constructed which are to be used as a reference in choosing these points.
Next, a procedure for stopping inspection when the process quality deteriorates is proposed. Deterioration of quality is usually indicated by a long series of screening inspection. The procedure provides a criterion of truncating large stopping numbers of screening sequence used in Murphy's rule, and a means of improving the discriminating power of the rule when the stopping number is small.
Simultaneous use of selecting method of sampling plans and procedure for stopping inspection can result in substantial savings in inspection cost.
Finally, a new method to control the process in Skip-Lot sampling plans is proposed. Utilizing the one to one relationship between Skip-Lot sampling plans and CSP-1, the method applied Murphy's stopping rule to Skip-Lot sampling plans. This method may enable the inspector to detect the deterioration of the process quality.
