SAP SE80

It opens the Object Navigator, an integrated workbench to browse and develop all repository objects, programs, classes, function groups, packages, Web Dynpro, in one place.

• Object list (by package, program, class, etc.).
• Integrated editors for each object type.
• Navigation between related objects.
• Where-used and activation.

• SE80 is the classic all-in-one workbench; ADT is the modern alternative.
• Browse a package to see all its objects.
• Use it to navigate from a program to the objects it uses.

• Getting lost in a large object tree.
• Editing standard objects (modifications).
• Not activating dependent objects.

• Browsing the tree instead of searching. The where used list answers most real questions in seconds, and walking a package rarely does.
• Activating one object and not its dependents. The package is left inconsistent and the error appears somewhere else.
• Using it for work ADT does better. The classic workbench is complete and no longer where the tooling investment is.
• Changing an object without checking the transport. Somebody else's task may already hold it, and you will find out at release.
• Assuming a package tells you what is used. Unused code sits in packages for years, so membership is not evidence of anything.