Almost every day at work, I find myself in a situation where I need to persuade someone to do something and most of the times, this someone wouldn't even report to me.
As you can imagine, this is extremely difficult to do because others have their own jobs and priorities and trying to impose yours on them isn't as simple.
I've found that to make someone to agree to a proposal (a pitch for an executive yes or a request to someone to do pieces of work) you need to rely on one particular weapon - influence.
Becoming influential, though, is a lengthy process that in my opinion revolves around building relationships with people and growing your own reputation.
But sometimes, even if you are the most influential person in the company, you'll inevitably get pushback.
Ideally, you should be prepared for such an outcome in advance. A helpful strategy I've used in such tricky situations is analysing and planning with Cialdini's six principles of persuasion.