Suggestion 4—Display the consequences of an action immediately (Immediacy of consequences)
per: The Usability of TrueCrypt, or How I Learned to Stop Whining and Fix an Interface by Sumeet Gujrati & Eugene Vasserman
TrueCrypt’s original file container creation wizard performs poorly in this regard: as discussed in Section 3.1, if an existing file is selected and “Next” button is pressed in step 1 (Fig. 2(a)), the wizard displays an overly lengthy warning message stating that the file already exists and will be replaced. If this warning is ignored, the wizard presents another warning when “Format” is pressed in step 5 (Fig. 2(e)). It is unlikely that users expect this behavior or know to return to step 1 to fix it.