Definitional rules are a type of business rule that form theories or produce information. They represent something that is fundamentally true or untrue about some concept within the organization. Unlike behavioral rules, which are about people's behavior, definitional rules constitute operational knowledge of the organization. They cannot be violated but can be misused. For instance, a definitional rule might be used to classify different categories of customers based on contractual agreements or order quantities.
The information provided here is verified and aligned with the concepts presented in the Business Analysis Body of Knowledge (BABOK) and other learning resources provided by the International Institute of Business Analysis (IIBA). Specifically, it reflects the understanding of business rules as outlined in the resources related to business data analytics certification and essential reading resources provided by IIBA12.

Impact analysis is a technique designed to identify the full consequences of a change within an organization.
It provides a structured approach for examining a proposed change to identify as many of the negative impacts or consequences of the change as possible. This analysis is crucial for understanding the ripple effects of changes and preparing for them, ensuring that the organization can adapt smoothly and maintain its operations effectively.
The concept of impact analysis and its importance in evaluating the effects of change are discussed in resources like "What is a Change Impact Analysis or Assessment?" and "Impact Analysis - Identifying the Full Consequences of Change" which explain how this analysis helps in identifying who and what will be impacted by a change and the specific impact on people, processes, tools, organizational structure, roles, and technology12.
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The task that uses the "Elicitation Activity Plan" to draw out, explore, and identify information relevant to the change is "Conduct Elicitation." This task involves direct interaction with stakeholders or independent research to understand stakeholder needs and identify potential solutions that may meet those needs. The Elicitation Activity Plan guides the business analyst through the planned elicitation activities, ensuring that the elicitation is focused, efficient, and aligned with the project objectives. This structured approach to elicitation helps in gathering relevant and accurate information, which is essential for the success of the change initiative .

Reusable requirements are those that can be applied across multiple projects or contexts without being tightly coupled to a specific solution. This is achieved by ensuring that the requirement is:
* Technology-agnostic
* Independent of a specific implementation
* Focused on business rules or policies
Such characteristics make them valuable long-term assets for future initiatives.
BABOK Reference:
Found in the Requirements Life Cycle Management knowledge area, under the task "Maintain Requirements," which emphasizes maintaining requirements that may be reused across initiatives.

Effective communication in business analysis is characterized by being bi-directional and iterative. This means that information flows both ways between stakeholders and the analyst, and this exchange is repeated as needed to refine understanding and ensure alignment. It involves active listening, clarification, and feedback to facilitate a shared understanding and to ensure that the requirements and solutions are aligned with the stakeholders' needs. References: The characteristics of effective communication are supported by the BABOK Guide, which emphasizes the importance of verbal, non-verbal, written communication, and listening skills for business analysts12.