SLASHER FILM RULES - Peeping Tom (1960)

Films have formulas and rules, but how well do films follow those formulas?  Are the slasher film rules true?

Peeping Tom (1960) is a serial killer film, called by some a precursor to slasher films, but does it follow the slasher film rules?

SLASHER FILM RULES - Psycho

"We all go a little mad sometimes." ~ Norman Bates.

Psycho, Hitchcock's 1960 classic, with cinema's most famous shower scene, and referenced time and again by the makers of slasher films.  But does it, itself, follow the rules?