1 Manila Mayor Alfredo Lim didn't properly activate the crisis management committee, which meant the chief negotiator and others didn't have critical information.
2 Authorities didn't appreciate Mendoza's demands, and so only gave him a promise to review his case, not reinstate him. And the demands didn't reach the Department of Justice, meaning it could not get involved.
3 Mendoza's brother Gregorio shouldn't have joined the negotiating team that presented the offer of a case review to Mendoza; and he shouldn't have been allowed to tell Mendoza his police service weapon had been confiscated.
4 Chief negotiator Orlando Yebra, Lim and district police chief Rodolfo Magtibay were preoccupied with Gregorio at a critical moment, costing precious time and setting off a chain of events that led to Mendoza becoming 'fatally hostile'.
5 Lim ordered Gregorio arrested.
6 Lim and Magtibay left the advance command post at a crucial time to have a meal, creating a vacuum, with subordinates unable to cope.