着工 and 工程: A Planned Construction Start and Work Stages
Compare a library's planned start and a prior briefing with a product-stage diagram and the risk of skipping a step. Distinguish when construction starts from how work stages are arranged.
A planned start and a prior information session
着工 (ちゃっこう) means the start of construction. 「新しい図書館は来月着工する予定だ。」 — “Construction of the new library is scheduled to begin next month.” 来月 and 予定 place the planned start next month, without reporting that construction has already started.
「工事の着工前に近隣住民への説明会が開かれた。」 — “An information session for nearby residents was held before construction began.” The English quotation uses before construction began. The Japanese and Korean statements report an information session before the start; keep that reported session separate from an additional claim that construction itself started.
Stages in a diagram and a risk from omission
工程 (こうてい) means a process or work stage. 「製品が完成するまでの工程を図で示した。」 — “A diagram showed every stage in making the product.” The diagram presents the stages involved in making the product. Showing those stages does not establish that the product was completed.
「作業工程を一つ省くと品質が落ちる恐れがある。」 — “Skipping one step in the process may reduce quality.” This states a possible loss of quality if one step is skipped. Preserve the condition and risk, without turning them into an actual omission, an actual quality loss, or permission to skip the step.
A starting point and an arrangement of stages
The 着工 examples focus on a planned starting time and a briefing held beforehand. The 工程 examples focus on the arrangement of work stages and the risk from omitting one.
A preparatory session and a stage diagram are not themselves evidence of work beginning or a product being finished. Keep the plan, session, diagram, and risk within their separate statements.
How do the library's planned 着工 next month and the diagram of 工程 differ in focus?
Show the answer and why
The first gives the planned construction starting time; the second shows the arrangement of work stages. A prior briefing or a diagram alone does not establish that construction started or the product was completed.