Assessment

Science Fiction =                                                     Fear   (THEMES)   -       propell      -       progress

Aliens    (Vulnerability control) (Aggressive/ mentally unstable and abusive Peter)

Unknown 

Space (Battle school, intergalactic battle)   (Not being good enough Ender  Graff plus Humans

Space Travel

Tachnology (Not being sophisticated enough) (Buggers better tech, Enhance knowledge, weapons ansible) (Ender concerns, mental development)

Future

Apocalypse (end of world) (Fear of death)