Verification v Validation

Verificaton should not be confused with Validation

Validation
Validation is a basic process. It checks that correct (valid/expected) barcode data is being scanned and that it reads. It does not test barcode quality and whether, or not, the code will scan with any other scanner. What can be read by one scanner cannot always be read by another. You need to be sure it will scan with your customer’s readers, and their customer’s readers.

Verification
Verification is a test of barcode quality. It can check the accuracy of a given symbology against a set of Industry Standard Specifications. Verifying de-codes and measures key parameters of the bar code symbol defined by the bar code’s specification. If a deficiency exists in a bar code symbol, verification results will help focus corrective action activities.

The Two Verification Methods
There are two methods of barcode verification, Traditional and CEN/ANSI/ISO (usually referred to simply as ANSI). In very simple terms, Traditional verification analyses how well the code was printed whilst CEN/ANSI/ISO verification predicts how well a barcode scanner will read a code. Supermarkets require ANSI Grade C or above.

Why Bother?
Verification is the only way to ensure that you print good codes [pdf]. If you supply products to major retailers they are an essential quality tool. Where supermarket fines erode profits the return on investment with an On-Line Verifier can be measured in weeks, if not days, as fines for out-of-tolerance bar codes are eliminated. Resultant fines from, say, a simple thermal ribbon crease can cost many times more than an on-line verifier. Verification enhances a supplier's reputation and secures business.

Who should verify bar codes?
If the cost of printing a bad barcode is minimal, don't bother. However, if you must conform to barcode compliance or if printing a bad barcode results in fines, loss of business, redundant work, or other high-cost repercussions, then a verification system is essential.

Suppliers to retail chains need to avoid fines for bad bar codes. Pharmaceutical manufacturers must ensure properly coded product to avoid dispensation of incorrect materials. Chemical manufacturers must ensure properly coded product to avoid costly fines and legal action. Automotive suppliers must ensure labels meet industry specifications. Automated warehouses can avoid bottlenecks by insisting their suppliers use a verification system.

When should you verify your bar codes?
Verification should take place immediately after or, preferably, during the printing process and before the bar codes enter the system.