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.
Construction Project Manager. 1  The Construction Management Association of America (CMAA) maintains the Certified Construction Manager (CCM) designation. The purpose of the CCM is to standardize the education, experience and professional understanding needed to practice construction management at the highest level.