Criteria for sampling

• Goal Orientation

The sampling design should be based on the study's goals and objectives

• Measurability

The sampling design provides the data necessary for analysis.

Research seeks to develop or test theories based on ‘hard evidence’. Concepts of interest must be stated in measurable ways.

• Practicality

The actual activities of sampling should be identified and feasible in the actual situation

The sample design must translate theoretical sam­pling models into clear, simple, practical, and complete instruc­tions for the conduct of the survey.

• Economy

Research objectives can be met with available resources.

Economy concerns the fulfillment of survey objectives with minimum cost (effort) and the degree of achieving that aim. Economy requires that the objectives be met with avail-
able time, financial, personnel, and any other necessary resources.