Terminology comparisons

Pairs of terms that people regularly confuse, explained side by side. We only publish a comparison when it teaches something a single definition cannot.

• Change order vs change directive vs supplemental instruction

  Three CCDC 2 instruments for changing or clarifying the work. Which one applies depends on whether price or time change, and whether they are agreed yet.

• Design-bid-build vs design-build vs construction management

  The three most common delivery methods differ in when the builder joins, who carries design risk and how the price is set.

• Level of development vs level of information need

  Both describe how much information a model element should carry. LOD uses numbered levels from the BIMForum specification; level of information need (ISO 7817-1) describes requirements explicitly by purpose.

• MIDP vs TIDP

  Both are delivery schedules under ISO 19650-2. A TIDP is one task team's plan; the MIDP combines all of them for the delivery team.