Let's just say that the 4 items making one construct are not well correlating (for whatever reason) and their Cronbach is 0.62 despite loading into 1 factor. Is there an alternative way to proceed? Can I skip Cronbach/validity issues/factor analysis by just summing all 4 items and then getting their mean by dividing the total sum by 4? After that, I can use the new mean (variable) as a dependent one in my regression analysis. Has this been done before? Is it an acceptable practice?