The Single Session model, described by Windy Dryden on their book, is an excellent approach to maximise the potential to problem-solve and tackling problems on each session.
When time and resources are scarce, this approach allows for a mutual agreement of the purpose, goal and outcome of each session. For me, it helps me to remain focused and consider each intervention as a stand-alone process.
The agreement either with the client must include, aside from the aim of the session, a method to measure the results of the session, good signposting and appropriate feedback.
For coaches aiming to work with adults, especially those with ADHD, this book should definitely be in your library. For best results, open it and read it! The book is only a few pages long, large print, with loads of formatting. Easy to pick it up, scan through the pages and find something useful.