Pekao24 is an internet banking interface, that belongs to polish Bank Pekao SA, a member of the global UniCredit Group. Its GUI was recently refreshed by the K2 Internet SA agency.
In this process, a complex prototype was created with Microsoft Visio™ and VisDynamica, that covered all the important use-cases. Visio allowed to give the prototype realistic graphic features, and VisDynamica made it fully interactive, so it could be reliably tested with the end-users.
The 450 distinct views of the prototype included:
- Standard and multistep forms with validation and value remembering
- Multiple dropdowns, context help tooltips and error messages
According to the case-study, this is one of the first sketches of the information architecture:
And this is how the actual VisDynamica prototype looked like during the user testing:
There is also a very interesting slideshare case-study available (only in polish, but it has many nice pictures 
).