# Should I standardize questionnaire responses prior to reliability analysis?

I have a multiple questionnaires with responses on Likert scales. They differ in that some are rated on a 7p scale, and others on a 5p scale. I would like to look at the reliability of each scale as well as the correlation between scales (and sub-scales).

By standardization I mean computing the z-score (subtract mean, divide by standard deviation), or should I merely normalize the range (scale every item to $$[0,1]$$), for better comparison?