Having clarity ensures that you are working towards a common goal. You should be clear in terms of project objectives, timelines and expected deliverables.
When team members clearly understand how feedback will be provided and whom to contact for assistance, project outcomes are likely to be accomplished.
When developers have access to all necessary resources, they can work on the project efficiently and with increased productivity.
When hiring Salesforce developers on a contract basis, having a clear payment schedule sets clear expectations for both parties involved.