(Portland, OR) -- Around four-thousand nurses and other healthcare workers at Kaiser Permanente in Oregon and Southwest Washington will hit the picket line Tuesday. They've been negotiating on a new contract since March. They want better pay, staffing conditions, and safer working conditions. It's a limited strike that could last through Sunday. Kaiser says they've been preparing for the strike and hospitals, medical clinics, dental offices and pharmacies will remain open. They're bringing in 76-hundred nurses and clinicians.