Basically phase is an angle of line joining the origin and the any point on the wave with $x$ axis of our reference frame and the word phase is defined for the single wave function. But the phase difference is defined for two waves.
To become a Certified Construction Manager (CCM), you must have a requisite amount of experience and/or education. ONE of the following: An undergraduate (4-year BA/BS level) or graduate qualifying degree. A 2-year undergraduate qualifying degree (AA/AS level) AND 4 years experience in general design/construction.
Certified Professional Contracts Manager (CPCM) Certified Professional Contracts Manager Contract professionals who have mastered the majority of the contract management competencies in the Contract Management Body of Knowledge (CMBOK), extensive business education and training, and a minimum of 5 years of experience can apply for the CPCM certification.