changeover, conversion, modulation, passage, transitionary, transformation, phase, shift, process, reorientation, more...

stagnation, inertia, standstill, immobility, constancy

first-order, second-order, third-order, zeroth-order, more...

smooth, gradual, demographic, democratic, rapid, easy, abrupt, sudden, successful, economic, political

segue starter,   life change,   move between,   state of change,   segue way,   go from,   from this to that,   shift from,   new phase,   change in subject