A local government won't have the software developers on staff to handle eg a new computerized transit ticketing system. I've also seen Accenture used to handle

A local government won't have the software developers on staff to handle eg a new computerized transit ticketing system. I've also seen Accenture used to handle SAP rollouts, which can be immensely complex. I'm not saying they did a good job at either of these tasks, but that's what they were hired for. Re the terms you want explained, just use your favourite search engine. There are legitimate and established definitions for these things. Eg, your bank likely uses Cobol from the 1960s in its backend and they would dearly love to replace it because all of the original source is long gone. This is a legacy system.