Investments require the establishment of sufficient business rationale to determine the value that each is going to bring to the business to justify the required expenditures and resource allocations.
Call it a business case – business justification; we anchor our investments in testing to meet quality objectives in support of business goals. We measure success (meeting specifications) through testing/validation. Your ability to articulate the expected benefits and associated cost of quality through investments in testing will be decided by the merits of your business case/rationale. These goals or quality dimensions can be qualified (reliable, scalable, accuracy, performance, etc) and/or quantified (say by a 5% increase in sales revenue or market share) but regardless, you still need to identify the value and benefits the investments (testing) will bring and have contributed to the business.