One size does not fit all. Same as Process. Process varies dpending on problems, scope, organization, team familiarity, skill level. On every account, all processes contain three primary steps.
Discovery, also known as Research, is the first and the most critical step. The goal of discovery is to identify the problems, to eliminate the distraction, and then to set the goal for everyone.
Ideation and Validation brings the difference to the solution.
Development makes the design come true.
Iteration, iteration, iteration is the key to success.