Tests presents a value-efficient usually means of detecting defects. These defects can then be taken out (by debugging – a non-screening activity), so testing indirectly contributes to higher-good quality check objects. Screening gives a method of immediately analyzing the caliber of a test item at different levels from the SDLC. https://elliottubfkp.blogmazing.com/30537091/lever-4-0-an-overview