I'm at a crossroads with my WIP, trying to decide whether, and when, and where, to add a second POV character. My initial idea had been to write the first half (ish) of the story from one POV, then switching partway through, coming back to the original character at the end. I intended the effect to be a little jarring - you go through part of the story with one character and then go back in time a bit to experience what the other character was going through during that time. However, as I make more progress on the story, I'm not sure that will work as well as I originally thought. I feel like the reader needs to experience more of the early story from the eyes of both characters in order to get in both their heads, hopefully increasing the reader's empathy for both of them.
My question isn't so much specific to my decision with my WIP, but I'm curious how others are handling POV. Are you telling a story from the POV of just one character? Several? How do you know when to go back and forth between them? Are you aiming for a balanced approach, with the characters getting fairly equal treatment? Or do you interject a scene in the POV of a differing character occassionally, when it seems necessary?