deputy chief of operations mark gonzales to explain how firefighters assess the plan of attack on a working fire. >> good evening, vice president nakajo, commissioners, chief. i was trying to figure out how to work on my opinion in the art work on the subject, but i don't think i can. so i'll go ahead. so it is a very comprehensive subject how firefighters and commanders assess the plan of attack on a working fire. structure fires are very dynamic incidents that require in most cases a complex decision matrix within one's head. fire ground decisions are made based on experience, training, resources available, building construction type, occupancy type, smoke conditions, fire conditions, building access, street access for apparatus, sides of the structure, roof type exposure, weather, time of day, topography -- as you know, we have hills. dispatch information you receive over the radio. on scene occupants give you info. often times that is vital information. our building under construction or renovation as we experienced on union street. and also the favorite subject, obstacles such as overh