Think about it from the perspective of a product inspector for a moment: Remove from your memory all of the information you have about your product, your supplier, and your customers' preferences.

It would be extremely difficult, wouldn't it?
A quality control checklist removes the element of chance from the inspection process (see also: 5 Essentials of an IPQCCO Checklist).

The following are five inspection steps in which quality control checklists are essential:
The majority of product inspections follow a process quality control includes several distinct steps.
Drawing random samples for inspection is the first step.
If factory employees are given the authority to choose which units will be inspected, this can actually reduce the accuracy of the inspection.

Many importers, however, are unaware quality control their IPQCCO team also consults an IPQCCO checklist to determine how large of a random sample they should collect from their customers.

is possible for inspectors to check too many units, which will increase the amount of time required to inspect and, if your inspector is billing you on a time basis, will raise your costs; or inspectors may check too few units, which reduces transparency and increases the likelihood that defects and other product issues will go unnoticed.

2. Examining the product in relation to the specifications
A typical IPQCCO checklist includes product specifications such as the following:
Color of the item
Marking and labeling of items, as well as
Appearance in general

3. Verifying that the packaging requirements have been met
The majority of the time, obvious packaging problems are easy to spot.
What can go wrong if the packaging isn't reported in the proper manner?
is possible  a nonconformity such as transparent tape on a shipping carton rather than opaque tape will not cause problems for you.

4. Identifying, categorizing, and reporting quality defects
Most products are susceptible to a specific set of quality defects that are specific to their product type. In the case of wooden products, for example, warping is a defect that is well-known.
However, if your IPQCCO checklist does not include clarification, your inspector is more likely to report product defects incorrectly or to omit them entirely from their report. IPQCCO professionals typically categorize defects into three categories: "critical," "major," and "minor," in descending order of severity.

5. Carrying out on-site evaluations
Product inspectors rely on inspection checklists for a variety of reasons, including providing testing criteria and procedures, testing sample sizes, and other information.

Let's say you're in the business of manufacturing electric blenders, a product  has a number of components quality control must all work together:The lid must be able to close properly on the container.

Additionally, the container must be able to properly fit onto the blade assembly, and the blade assembly must be able to properly fit onto the base unit

Generally, a fitting test, as well as function testing, are required in this situation to ensure that all moving parts are in proper working order. For this test and its steps, the inspector will refer to your IPQCCO checklist, which you provided.