(1) Leave of absence pursuant to sections 12-2, 12-4 and 12-5, first paragraph, may be taken as partial leave of absence.(2) Partial leave of absence is based upon an agreement between the employer and the employee. The employees' wishes as regards how partial leave of absence is to be taken shall be met unless this involves significant inconvenience for the undertaking. An employee shall be entitled to engage the assistance of an elected employee representative or another representative. An agreement on partial leave of absence may be amended or terminated when special grounds so necessitate.(3) Partial leave of absence must be taken within a time frame of three years.