By saying ‘NO’ you show that you think of the results.
Examine your responsibilities. Do you carry them out to the best of your ability?
Logic dictates you spend less time on each individual task as your workload increases. It’s reasonable to conclude this affects quality.
The 80/20 rule, or the Pareto Principle, helps us to put things in perspective. The rule suggests 80% of results stem from only 20% of causes, or effort.
In other words, select the few consequential jobs to concentrate on. Assign skills and resources to those responsibilities and the high-quality work will be valuable, tangible output.
If you always say “yes,” you reduce the effectiveness of your skills.