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During the software development, errors may occur even when software testing assurance tools are of the best quality. Avoiding such errors and artifacts from products at early stages is critically important in order to supply the needs of users. This paper presents methods of improving software quality through various phases of product testing such as validation, verification, testing review, inspection and walk through etc. It is clear that techniques used to check the quality of software in product lifecycle will be testing and reviews. Testing and reviews are part of validation and verification (V&V) processes, that assist to improve the quality of software product. There are some researchers arguing that one technique is more reliable and efficient than others. However, it seems that there are testing techniques and reviews suitable for specific occasions. For example, an inspection technique is better in finding a design error while testing techniques are unable to find errors in requirements documents or in source code.