take notes about 5 essential things about people:
[N] - Index a [n]umber of other people another person knows:
n1: your neighbour
n2: your friend Y
[O] - Index physical [o]bjects that other person is related to:
o1: your car
o2: your airplane
[P] - Index physical [p]laces the
other person is related or have been to:
p1: NY, where we first met
p2: the place you said you have been with Y (n2)
[E] - Index [e]vents related to the other person:
e1: the day when you got back from X conference
[S] - Index [s]ubjects that you have discussed in more details with the person you are taking notes about:
s1: the project ABC that we have talked about (e1)
In short, do [N][O][P][E][S] to take meaningful NOTES about other people's (or even one's own) lives to remember them better.
(P.S., presently I am not sure, weather all the most important human experiences can be classified into these classes, but it seems so.....)