Involving end-users early in the process of New Product Development (NPD) has proven leading positive effects on further developments of the design and success of new products. In the early stages of NPD designers often use sketches to communicate their ideas, to get feedback to iterate and develop the design. While the relevance and value of sketching as part of the design process and the usability to communicate ideas more effectively have been investigated, little research has been conducted looking at the elements that support effective means of generating insights from end-users. Sketches are often used according to the appropriate purpose and context of the situation, different types of sketches can be used to convey their idea. It is important to understand what elements of the different types of sketches are that generate most valuable feedback from the user involved in the development process. Presenting end-users 5 types of frequently used sketches showed that the information sketch was most favorable, followed by the scenario sketch. The use of color, explanatory elements and context of the product were important factors for the preference of these types of sketches.