Design is the creation of a plan or convention for the construction of an object, system or measurable human interaction (as in architectural blueprints, engineering drawings, business processes, circuit diagrams, and sewing patterns).[1] Design has different connotations in different fields (see design disciplines below). In some cases, the direct construction of an object (as in pottery, engineering, management, coding, and graphic design) is also considered to use design thinking.

Substantial disagreement exists concerning how designers in many fields, whether amateur or professional, alone or in teams, produce designs. Kees Dorst and Judith Dijkhuis, both designers themselves, argued that "there are many ways of describing design processes" and discussed "two basic and fundamentally different ways",[9] both of which have several names. The prevailing view has been called "the rational model",[10] "technical problem solving"[11] and "the reason-centric perspective".[12] The alternative view has been called "reflection-in-action",[11] "evolutionary design",[8] "co-evolution",[13] and "the action-centric perspective".[12]

• Designers attempt to optimize a design candidate for known constraints and objectives,
• The Design process is plan-driven
• The Design process is understood in terms of a discrete sequence of stages.

The rational model is based on a rationalist philosophy[10] and underlies the waterfall model,[16] systems development life cycle,[17] and much of the engineering design literature.[18] According to the rationalist philosophy, design is informed by research and knowledge in a predictable and controlled manner.

Typical stages consistent with the rational model include the following:

• Pre-production design
• Update products and their info
• Track customers’ activity on the site
• Manage customers’ information
• Overcome geographical limitation
• Get payment with secure gateways
• Attract new customers via online marketing or simply by reference
• Increase your revenue