Constraint relation in pulley., Physics

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kindly send me a detailed explanation of string constraint relation on pulley based problems....2 solve it do v take a reference point from wich v take d velocities and den v go wid d equation dl(1)/dt + dl(2)/dt+.....=0 or do v take d differnece of velocties and den go wid d eq. dl(1)/dt + dl(2)/dt+.....=0

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