Acceptance Sampling

Acceptance Sampling

1. OBJECTIVE:

   • •To understand the basis for sampling and sampling plans
     • •To familiarize with the popular sampling inspections plans
       • •To provide a guidance on how to implement sampling procedures bases on the AQL
   • Sampling
     • sampling is concerned whit the selection of a subset of individuals from within a population to estimate characteristics of the all population
       • Advantages of sampling
         • 1.Less expensive because of less inspections
           • 2.Less handling of product hence reduce damage
             • 3. It is applicable to destructive testing
               • 4.Fewer personnel its involve in the inspection activities
                 • 5.Reduce the amount the inspection error
                   • 6.The rejection of the lot will motivate the supplier to continuous improvement
       • Disadvantages of sampling
         • 1.The risk of accepting a bad lots and reject good lots its present
           • 2.Less information about the product
             • 3.There is the need of and inspection plan
     • Sampling plans:
       • Sampling plans became popular during WWII as a result of the military resaving excessive defective munitions from the suppliers
         • can be applied for:
           • inspection
             • finished items
               • components
                 • raw aterial
                   • WIP (work in Process)
                     • supplies in storage
                       • maintenance operations
                         • Data or records
           • Usually a sampling plan involves
             • A single sampling plan for attributes is a statistical method by which the lot is accepted or rejected on the basis of one sample
       • Aspects of the sampling are important
         • the purpose of the sampling is to sentence lots no stimated
           • aceptance sampling simply accept or reject, do not provide any direct from QVSampling plans became popular during WWII as a result of the military resaving excessive defective munitions from the QC
             • not used to inspect quality in the product inspect
         • ISO 2859-1:2014 (sampling for inspection by attributes)
           • ISO 2859 is a international recognized standard that specifies an acceptance sampling system by attributes the objective is to induce suppliers to maintain a quality level that is at least equal to the AQL specifies by the buyer.
             • four additional levels ( s1,s2,s3,s4) are given in the table one also and maybe used where relatively small sample sizes are necessary and larger sample risks can be tolerated
               • following some examples where this especial levels come in handy:
                 • 1.We wont to have a packaging product in full but only on a few cartons
                   • 2. We wont to perform some time consuming test for example a full functional test on a electronic product but we do not have time to run test
                     • 3.We wont to perform destructive test for example inspecting bullets by inspected them and obviously we don’t want to distort to many samples. EXAMPLE OF HOW TO USE tables wen using especial inspection levels let´s say you are buying 50,000 salt and pepper sets in ceramic there are several convinations and some booklets are included.
   • What is a acceptance sampling?
     • It refers to the process of randomly inspecting a certain number of items from a lot in order to decide whether to accept or reject the lot
       • Differences between quality control and acceptance sampling
         • Acceptance sampling before the process involves sampling materials received from suppliers
           • Acceptance plan:
             • There are some different methods used by the organization whit the purpose to evaluate the quality characteristics of parts and products and they are:
               • a)Non inspection
                 • b)100% checking
                   • c)Constant percentage inspection
                     • d)Audit sample
                       • e) Acceptance sampling based on probability
             • What is acceptance plan?
               • Is a schedule of tasks that are required to gain confidence that the customers are accepting parts a satisfactory form it is a document that clearly states the rules for sampling at the associated criteria for the acceptance or otherwise an acceptance plan consists of procedures for inspecting incoming material of finished goods.
                 • It usually specifies:
                   • Type of sample, The sample size (n), The criteria to be a plan
               • When to use an acceptance plan?
                 • You should create an acceptance plan every time you need to produce a set of deliverables that required the customer approval before completion
         • Sampling after the process involves sampling of finished items that are ready to be shipped either to a distribution center and or custom

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