ABET ACCREDITATION EVALUATION IS AN 18-MONTH, FIVE-STEP PROCESS.
This process is the culmination of a practice of ongoing self-assessment and continuous improvement, which assures confidence that ABET-accredited programs are meeting the needs of their students, preparing graduates to enter their careers, and responsive to the needs of the professions and the world.
For a visual timeline of the accreditation process, see Accreditation Step-by-Step
BEFOREHAND – ASSESSMENT AND ELIGIBILITY
Before seeking ABET accreditation, your program should determine if it falls into the categories that we accredit, and that it meets our Eligibility Requirements. Prior to seeking an accreditation review, each program must have a functioning assessment process in place that meets our criteria for accreditation in three areas: Program Educational Objectives, Student Outcomes, and Continuous Improvement.
References:  This page has been copied from http://www.abet.org/accreditation/get-accredited-2/