There are various ways to do that, two of the quickest ones are
1) Turn the audit log on by using SM19 and SM20 and analyze the audit logs.Put filters while setting up these logs so that you can see the specific data.
2) In ST03N / ST03, you can analyze the transactions run by users by selecting the “User Profile” under the “Analysis Views” section.
Note: ST03N keeps limited data
You can use STAD too, more on that later…