Spreadsheets can also be used to store data but they are not as powerful as relational databases. Other forms of decision support systems are expert systems. These are powerful but expensive tools. They are especially useful when it is necessary to document the judgmental processes. In accounting, expert systems are used in auditing to help make judgment decisions on the level of substantive testing required.
Engineers also use expert systems.
In the olden days decisions were communicated using internal memos, reports or meetings. Computers have transformed this communication process. Email has replaced the internal memo. Email is faster. Just as mail spawned junk mail, Email has spawned junk Email.