Has anyone used UML?

[Frank Millman]

After 15 years of designing applications using the good old "seat of the
pants" method, I have decided that, if I am to move forward, I need a more
formal methodology.

I have recently read about UML (Unified Modelling Language), a
standards-based method of designing and documenting any software project. It
looks interesting, but it seems to have a steep learning curve.

Does anyone have any knowledge or experience of UML that they would like to
share?

TIA

Frank Millman