The purpose of the Design phase is to verify the desired performances and appropriate testing methods. Upon completion of the Design phase, you should be able to prepare a set of functional specifications for closing the performance gap due to a lack of knowledge and skills. The Design phase establishes the “Line of Sight” for progressing through the remaining ADDIE phases. Line of Sight refers to an imaginary line from the eye to a perceived object. An example of the line-of-sight concept is in communication where the transmitter and receiver antennas are in visual contact with each other. Line-of-Sight theory supposes that in order to view an object, you must sight along a line at that object; and when you do light will come from that object to your eye along the line of sight. Line of Sight is presented here as a practical approach for maintaining an alignment of needs, purpose, goals, objectives, strategies, and assessments throughout the ADDIE process. The varying levels of expertise among the stakeholders participating in the ADDIE process, and other contextual variables, require maintaining the line of sight throughout the entire ADDIE process. The notion of line of sight will directly influence the design team’s management and development activities. Activities beyond the scope of the project and matters unrelated to closing the performance gap may obfuscate the line of sight. During the client meeting where the Design Brief is delivered, there should be a high degree of confidence about the pathway to closing the performance gap.