Please could someone tell me if the following process map is ok?  It describes the process of requesting medical records from a client which the company is acting for - to do this we need to write to the client to get their authority to obtain their medical records and this form of authority once returned is sent to the agency who do the work of obtaining the records from the various different hospitals on the clients file. 

I'm not really asking for help in terms of the logic here (it follows through ok to myself and the developers I work with) - what i'm more interested in is how I could portray this better in an industry standard way.  I'm fairly new as a business analyst and want to do consultancy work in future so I want to be using the correct notation etc.  e.g. for doing a loop and so on...      I've just drawn this diagram in a 'common sense' sort of way, but is this good enough or should i be more specific with my notation?

Image below, Thanks.

[IMG]http://i60.tinypic.com/azc577.jpg[/IMG]