[BlargMcLarg]

Start small and practice. Evaluate how people react to the task size and experiment from there. E.g. don't make someone annoyed by tasks way under their stature grow at the same rate as someone who struggles to deliver.

This goes for clarity, difficulty and size of the task. Don't make someone bad at filling the details do an unclear task. Don't make someone unskilled do a clear yet difficult task. Don't make someone with no track record work on a task for too many days without supervision. Etc.

Unfortunately, people not meeting standards you would will always be a thing unless you're leading people more skilled in the area of expertise. Which brings it's own set of issues.