Many possible reasons, including: - no engineering standards in computer science, including especially in education of computer science - some corporate finan

Many possible reasons, including: - no engineering standards in computer science, including especially in education of computer science - some corporate finance views which see technology as a cost center rather than a business enabler - some corporate strategies where marketing decides what is possible and when it must be ready (tomorrow. or yesterday.) - computing and software development as a "fun", creative endeavor - as opposed to a rigorous, formal process I'm sure there are dozens more reasons.