TASK DEFINITION: In this task, you're given a pair of sentences, sentence 1 and sentence 2. Your job is to write a single word that describes the genre that the two sentences belong to, such as face-to-face, government, letters, 9/11, slate, telephone, travel, verbatim, oup, fiction.
PROBLEM: Sentence 1: However, cost models have significant limitations in accuracy unless their underlying assumptions of system size and cost drivers are carefully chosen and reflect the agency's previous experience in system development. Sentence 2: Cost models aren't usually too accurate, but sometimes they can be.

SOLUTION: government

PROBLEM: Sentence 1: 7) The Postal Service integrates the pieces back into its own system and takes them to the facility out of which the carriers operate. Sentence 2: The postal service does no such integration 

SOLUTION: government

PROBLEM: Sentence 1: His face is stern and somewhat goat-like. Sentence 2: He had a gentle face.

SOLUTION:
fiction