You must be able to send clear messages and listen carefully as well. Ask your employee to repeat back what you have just explained. This will assure you and your employee of exactly what the task entails. Communication is one of the most important elements of human endeavor. Information is power but the power is multiplied when information is shared.
Feedback is most effective when given regularly and often.
As you notice something to comment about, you should immediately give a complement or offer some helpful instruction to correct a mistake. An effective way of communicating important information to your employees is at a staff meeting. You can explain something one time for everyone. Everyone then knows that all of the team members have received the same information. This makes for much less confusion and disagreement among the team members.