NOTES FOR THE ACCUSER:

How to report a suspected sock puppet:

1. Assume good faith, if possible. An alternate account that is not used for abuse does not warrant a complaint. Keep in mind that users may sometimes make mistakes, so in cases where an alternate account is largely used for legitimate activities, it may be appropriate to ask the user before making accusations. The problem might merely have been caused by a mistaken login or other absent-mindedness.
2. Fill in the names. Clicking "Start a case" with a new case name-or-number opens a fresh page, with a form ready to be filled in. The puppetmaster's name will be automatically filled in as the filename; if this is not correct, due to added numbers like "(2nd)", replace the {{SUBPAGENAME}} tags with the puppetmaster's username. Also replace the placeholder names SOCKPUPPET1 and SOCKPUPPET2 with the account names of the suspected puppets; add or delete these lines as needed. Always leave out the "User:" prefix.
3. Make your case. Now write up your evidence in the "Evidence" section. This should describe why you believe there's puppetry occurring, however obvious it might be. If this is not the first time the user is suspected, links to other cases you know about should be provided as well. The evidence should point to one or more instances of illegitimate use of the puppet account. Include the diffs to support your statements. Sign and timestamp your case with ~~~~ on the line below "Report submission by"; preview your report for any problems; and, when you're satisfied, save it.
   

   To start a case report about suspected sockpuppetry: Cases are created on subpages of Wikipedia:Suspected sock puppets. To do so, add the username of the puppetmaster (the main account, not the sockpuppet!) -- and the number of the case, "(2nd)", "(3rd)", etc., if there were previous cases on that username -- into the box below. Leave out the "User:" prefix. Replace only the word PUPPETMASTER, leaving the rest as is. Example: if there were already two cases about User:John Doe, the new case would be titled: Wikipedia:Suspected sock puppets/John Doe (3rd) Then click "Start a case". You will be taken to a page where you can fill out the report. After you've saved the report, come back to see the remaining instructions below this box. Use of this form is deprecated. Please use Wikipedia:Sockpuppet investigations.

4. List your case for review in the WP:SSP open cases section . Add the line {{Wikipedia:Suspected sock puppets/PUPPETMASTER}} (or PUPPETMASTER (2nd) or PUPPETMASTER (3rd), etc.) , just below the section header. (Again, remember to replace PUPPETMASTER with the actual account name, without the "User:" prefix.) Save your edit. Check to see that your report shows up at the top of the list, just below the "Open cases" header. If there's only a red link, check that the spelling of the username and the number match the filename you created.
5. Notify the suspected users. Edit the user talk pages (not the user pages) of the suspected sockpuppeteer and sock puppets to add the text {{subst:uw-socksuspect|1=PUPPETMASTER}} ~~~~ at the bottom of the talk page. If this is not the first time the user is suspected, the most recent evidence page should be specified by adding "(2nd)" or "(3rd)", etc., after the user's name: {{subst:uw-socksuspect|1=PUPPETMASTER (2nd)}} ~~~~ or similar.
6. Consequences. If the evidence shows a case of clear abuse, with no serious doubt, an administrator may block any sockpuppets, and take further action against the puppetmaster. In less severe cases, administrators may quietly monitor the account's activities.
7. Checking further. In some cases, where there is significant abuse and yet puppetry is not certain, it might be appropriate to use technical means to detect puppetry. See Requests for checkuser (WP:RFCU) for details.

"How to report a suspected sock puppet"
is the text of the "Reporting suspected sock puppets" section at
Wikipedia:Suspected sock puppets (WP:SSP).

Questions and comments should be directed to:
Wikipedia talk:Suspected sock puppets (WT:SSP).