1) Assiduousness 2) Diligence 3) Meticulosity 4) Meticulousness 5) Painstakingness 6) Punctiliousness 7) Strictness 8) Thoroughness 
Conscientiousness is the personality trait of being thorough, careful, or vigilant. Conscientiousness implies a desire to do a task well. Conscientious people are efficient and organized as opposed to easy-going and disorderly. They exhibit a tendency to show self-discipline, act dutifully, and aim for achievement; they display planned rather than...
• (n.) The quality of being conscientious; a scrupulous regard to the dictates of conscience.
Con`sci·en'tious·ness noun The quality of being conscientious; a scrupulous regard to the dictates of conscience. 
noun the trait of being painstaking and careful noun the quality of being in accord with the dictates of conscience