I've got it down to five words, reduced from several week's reading:
Those who come up with ideas are recognised for their input and achievement.
Their ideas are realised; they go into production or become reality.
Resistance to the idea and to change is overcome.
They receive reward which might be a bonus, or shares or promotion beyond a handshake and some time at the top table.
It is everyday, routine, part of the culture of the place not a bolt on fad like TQM and Quality Circles of the 1990s.
People stay in, they are retained because of the above and so go on to innovate again rather than for themselves or the competition.