Integrating interaction design with an agile software development approach is useful because:

a$.$

An agile approach incorporates tight iterations, feedback and collaboration with the customer

b$.$

By using an agile approach, developers can start coding immediately to save time and costs

c$.$

An agile approach does not require that all critical design elements are captured in a design document

d$.$

An agile approach requires all software development processes to be specified before development begins to ensure rigour.