tendency has been to lose sight of the crucial part played by nonverbal knowledge in making the "big" decisions of form, arrangement, and texture, that determine the parameters within which a system will operate. In his work claims Ferguson that visual reasoning is a widely used tool used in creating technological artefacts. There is ample evidence that visual methods, particularly drawing, play a central role in creating artefacts. Verbal Verbal design tools are, for example, metaphor, description, discussion, critique, theory, algorithm, calculation, program. Computer programs Computer programs have many functions which can be discussed in terms of design tools. One of the most widely used design tools is computer-aided design (CAD) software like Autodesk Inventor, DSS SolidWorks, or Pro Engineer which enables designers to create 3D models, 2D drawings, and schematics of their designs. CAD together with Digital Mockup (DMU) and CAE software such as finite element method analysis or analytic element method allows designers to create models of designs that can be analyzed without having to make expensive and time-consuming physical prototypes. There is some debate whether computers enhance the creative process of design. Rapid production from the computer allows many designers to explore multiple ideas quickly with more detail than what could be achieved by traditional hand-rendering or paste-up on paper, moving the designer through the creative process more quickly. However, being faced with limitless choices does not help isolate the best design solution and can lead to endless iterations with no clear design outcome. A designer may use sketches to explore multiple or complex ideas quickly without the distractions and complications of software. Digital Service Design Tools In recent years we have seen the growth of digital tools and computer programs within the discipline of Service Design that facilitate aspects of the design process. For example, tools such as Smaply by More than Metrics allows users to create and collaborate on digital Personas, Stakeholder Maps and Journey Maps. Digital tools can enable people wishing to practice Service Design with an accessible and convenient means to integrate and build design capacity within their organizations. Digital tools offer a range of benefits over traditional pen and paper methods, including the ability to export and share outputs, collaboration at a distance, real time updating and the integration of various data streams. See also Design method Design strategy Reflective practice Computer-aided design Bibliography Design - Creativity and Materialization. Cottbus, 1999, ISSN