Doing What Works: Forward in Solution-Focused Change: Your body language shapes how you are

10 Tips to make your writing more solution-focused

Make it useful by asking in advance what the other person's expectations are from your text.
Make it simple: make your words, sentences and structure no more complicated than strictly necessary.
Match the use of language of the other person.
Respond adequately to comments and questions.
Formulate positively: whenever possible, use positive and specific language.
Activate the other person: ask good questions.
Motivate your choices and decisions in a compact, clear and positive way.
Check whether you have understood the other person well and whether your text is useful for him or her.
Invite the other person to offer feedback, suggestions and corrections.
When, in a proposal, you offer more than or something different from what the client has asked for, it often works well to mention that part as a separate module in your text so that it will be much easier for the client to choose or ignore that part.

More about this here.

6 critical reflections on the importance of doing what works

Sometimes at first something seems to be working well but after some time it turns out it doesn't
In some cases doing what works is difficult because things may 'work' extremely slowly
An overreliance on doing what works may lead you to forget about maintenance
An overreliance on doing what works may lead you to forget about investment
The complexity of situations may make it very hard to single out was has been working
How do you know what level of 'working' you should be satisfied with?