How to say "Development" in Japanese

When translating "development" into Japanese, you must choose carefully between 発達 and 発展. In Japanese, 発達 (はったつ (hattatsu)) is typically associated with "development, growth" (Syllabus Level: N4) and represents Refers to the development or growth of something, often abstract like technology, economy, society, or an individual's abilities. Can be used as a noun or as a する-verb. On the other hand, 発展 (はってん (hatten)) maps to "development; expansion; growth; escalation" (Syllabus Level: N3) and represents Refers to development, expansion, growth, or escalation of scale or state. Often used as 経済の発展 or 関係の発展. ⚠️ Haruka's Voice Column: 'Development! "I want our relationship to develop into a marriage!" ...っ, T-To demand such an advanced development! B-But... I permit that development, so prepare the ring!' / 【ハルカ部長のワンポイント指導】『はってん（発展）！『僕たちの関係を結婚へと発展させたいです！』って…っ, そんな経歴的発展を要求するなんて！…でも特別に許可するわ！今すぐ指輪を用意しなさい！』. A literal translation of "development" can often sound unnatural to native Japanese speakers if mixed up!