1] (State The Situation)You promiseed your grandma you would help her on Saturday but you have a party to go to.
2] (List The Options)You could tell her you can't help on Saturday, stay with your grandma and not go to the party, or organize and go to both.
3] (Weigh The Possible Outcomes)Most likely you end up telling your grandma that you can't help or not go to the party.
4] (Consider Values)I consider you to tell your grandma every thing and ask if you can go to the party.
5] (Make A Decision And Act It)You go to the party and have a great time.
6] (Evaluate The Decision)Your at the party, your grandma doesn't care and you and your friends are having a great time.