Before I enter into a flop during a tournament, i look at all of these factors, feel free to add your opinion

1. Hand Strength
2. Position
3. Tournament Structure
4. My relative stack size
5. How much resistance I foresee from my opponents.
6. Cost effectiveness, I.E) Putting in 60 chips for a pot of 360, thus a 1:6 ratio in comparison to say, 120 chips for a 240 chips or a 1:2 ratio. * Very important when stack sizes are relatively even throughout your table or with the players involved in the hand.
7.I go back to # 3 to clarify, Say you want to blind steal, it is most opportune for either fast raising blind structure, or high Blind/Ante ration, whereas a sit-and-go with no antes and slow blind raising it would most likely be proper NOT to blind steal in most hands.
8. Elaboration on # 6, remember that if there are multiple limpers or just small raisers, and 4-5 people might see the flop, and you have a comfortable stack, it could be effective to see cheap flops for high ratio pots. Again for Example putting in 80 chips for a 400 size pot with 3-6 people in the hand. Also to note on hands with many people seeing the flop, other players cannot read your actions as easily, being masked by the situation of a multi-way pot.