一方、～一方で（は） (ippou-de): On the one hand; while
～一方、～一方で（は） (ippou-de)
Meaning
On the one hand; while
Formation and usage
plain clause + 一方（で）; N／な-adjective + である一方
Notation: N = noun; V dictionary = dictionary-form verb; V stem = the stem before ます; plain clause = plain-form clause; negative stem = the form before ない. Follow the attachment shown above.
Explanation
Contrasts two sides or situations; distinguish dictionary verb plus 一方だ for a one-directional trend.
Examples
研究は大切な一方で、休息も必要だ。
While research is important, rest is also necessary.
練習は大切な一方で、休息も必要だ。
While practice is important, rest is also necessary.
勉強は大切な一方で、休息も必要だ。
While study is important, rest is also necessary.
準備は大切な一方で、休息も必要だ。
While preparation is important, rest is also necessary.
仕事は大切な一方で、休息も必要だ。
While work is important, rest is also necessary.
How related patterns differ
一方で and 反面 present two sides; にひきかえ highlights a sharp, often evaluative contrast. わりに compares a result with expectations. といい～といい gives representative features, while というか～というか searches for a suitable description.