How does Shakespeare present honor in Romeo and Juliette?

In The Tragedy of Romeo and Juliet, the theme of honor can be discussed from several different angles. First of all, honor exists amongst the members of both houses, and the individuals loyal to the Capulets and the Montagues uphold their honor to the families. As well, the two lovers, Romeo and Juliet, honor each other with their commitment, taking their promises to each other to an extreme. Finally, after the deaths of Romeo and Juliet, both families honor their lost children by promising to honor each other as a way to mark and remember the untimely deaths of Romeo and Juliet.
The honor amongst the Capulets and the Montagues is observable even in the interactions between minor characters that represent each house, like the Capulet servants Gregory and Sampson, for example. Though their one-upmanship in the opening scene of the play is unhelpful in terms of maintaining peaceful relationships with the Montagues, it is very useful when analyzed as proof of the honor they feel as members of the Capulet household. Balthasar and Abram, who represent the Montagues, are similarly loyal to their household, and they engage in the brawl with the Capulet servants as a way to show honor to their house.
Romeo and Juliet, as the romantic leads of the title of the play, honor each other with their promises to be true to each other, even if being true means an early death. Romeo, though his dreamy personality and his past infatuations suggest an unreliability in his character, honors his word to Juliet, and this commitment to his pledge and to Juliet elevates their youthful love affair the the level of something sacred and profound.
Finally, the Capulets and the Montagues resolve their age-old conflict when they set aside their differences in order to come together to mourn the loss of their beloved youngsters. Had the conflict between the two houses not been so severe, Romeo and Juliet may met and fallen in love in an open and natural way, thus avoiding the tragedy of their deaths. By acknowledging that the rivalry between the two houses has caused the tragedy and by promising to resolve it for good, the Capulets and the Montagues honor the two young people who died for love.