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International  standardizations  efforts  as  a systematization and enhancement of the best practices have  valuable  impact  on  software  product  quality assurance. Software product quality and  its different aspects  are  goals  of  all  software  development  life cycle phases.  The  international  standards  selected  and described  in  this  paper  comprise  1)  those  defining software (development) life cycle processes (ISO/IEC 12207)  and  its  information  products  i.e.  related documentation  (ISO/IEC  15289),  2)  those  defining quality  models/different  quality  views  (internal quality,  external  quality  and  quality  in  use)  and quality  (sub)characteristics  and  metrics  (ISO/IEC 9126  parts  1-4),  and  3)  those  defining  software products evaluation (ISO/IEC 14598 parts 1-6). In the paper it is proposed too how the mentioned international  standards  could  be  used  through software development life cycle phases to plan, check and gain software quality.