Criterion 1: Owns a smart mobile

Engagement Policy Level: Group level

Explanation: The criterion "Owns a smart mobile" applies to all data plans and can be considered a group-level policy. It filters the audience at a broader level to ensure they have a smart mobile device.

Criterion 2:

Under graduation student

Engagement Policy Level: Issue level

Explanation: The criterion "Under graduation student" applies to multiple data plans (1 GB and 3 GB) and is more specific to the issue of targeting educational segments. Thus, it is suitable at the issue level.

Criterion 3:

Post graduation student

Engagement Policy Level: Action level

Explanation: The criterion "Post graduation student" is specific to the 5 GB plan and is most appropriate at the action level. This level ensures the targeting is precise for this particular plan.

New customer

Engagement Policy Level: Group level

Explanation: The criterion "New customer" can be applied across multiple offers and thus is suitable for the group level to broadly target new customers.

Existing customer

Engagement Policy Level: Action level

Explanation: The criterion "Existing customer" is applied at the action level to ensure specific offers (3 GB and 5 GB plans) are appropriately targeted to customers who already have a relationship with the company.

Step by Step Comprehensive Detailed Explanation with References:

Group Level Engagement Policy:

Conditions that apply broadly across multiple offers or groups of offers fall under group-level policies. Examples include owning a smart mobile and being a new customer.

Issue Level Engagement Policy:

Conditions that are relevant to a specific issue, such as educational status for specific data plans, are categorized under issue-level policies. This ensures that offers targeting undergraduates are consistently managed.

Action Level Engagement Policy:

Conditions that are specific to individual actions or offers are best managed at the action level. This includes targeting post-graduation students for the 5 GB plan and existing customers for specific plans to ensure precise targeting.

References: Pega's best practices for engagement policies recommend using group-level policies for broad criteria, issue-level for segment-specific conditions, and action-level for highly specific targeting to ensure effective and relevant customer engagement.