This article explains the what the different Dialer Methods do. They are used to choose in which way the system should make outbound calls to your customers in Dialer Campaigns.

Progressive
This is the most common method. The Dialer makes one outbound call per available agent in the campaign. When a customer answers the agent and customer will be connected.
Pros: There won't be any customer who is not connected with an agent.
Cons: If you have a lot of inaccurate numbers or a high amount of dropped calls it can be quite slow.

Power Dialing
The dialer makes more than one call per available agent in the campaign (you configure how many calls per agent).
Pros: The agent will get in contact with more customers quicker since it is more likely to reach customers when making e.g. five calls at the same time instead of one call. This method is good if you are using old or outdated contact lists with a lot of inaccurate phone numbers.
Cons: The system will connect the agent to the first customer who answers. If more than one customer answers the other customers will not be connected to an agent.

Predictive
The dialer uses an algorithm to predict how many calls to make per available agent in the campaign by looking at the answer rate historically. You can choose how far back in time it should base it's numbers on.
Pros: The system will choose the right amount based on previous calls and update automatically.
Cons: The system will connect the agent to the first customer who answers. If more than one customer answers the other customers will not be connected to an agent.

Preview
Agents uses call cards to dial customers manually.
Pros: The agent gets information about the customer beforehand. The agent can prepare and choose when to make the call. This is a good method to use when the agent needs to be prepared and have some information about the customer before calling.
Cons: It can be slow since the agent manually needs to call each customer.

BookedProgressive
The Dialer makes one outbound call per available agent in the campaign. The difference between BookedProgressive and Progressive is that the system will call the agent first and when the agent answers the system will call the customer.
Pros: The customer will always be connected to an agent.
Cons: If you have a lot of inaccurate numbers or a high amount of dropped calls it can be quite slow.