Information necessitating a change of design will be conveyed to the designer after and only after the design is complete.

Information necessitating a change of design will be conveyed to the
designer after and only after the design is complete. (Often called the
'Now They Tell Us' Law)
Fyfe's First Law of Revision

Related:

• Information necessitiating a change of design will be conveyed to the designer after -
  and only after - the plans are complete. (Often called...
• The more innocuous the modification appears to be, the further its influence will extend and the more the design will have to be redrawn.
  Fyfe's Second Law of...
• If, when completion of a design is imminent, field dimensions are finally supplied as they actually are,
  instead of as they were meant to be, it is always simpler...
• In simple cases, presenting one obvious right way versus one obvious wrong way,
  it is often wiser to choose the wrong way so as to...
• Design flaws travel in groups.
  Fifth Law of...
• After painstaking and careful analysis of a sample,
  you are always told that it is the wrong sample and...
• It is usually impractical to worry beforehand about interferences -
  if you have none, someone will make one for you. Fyfe's...
• Conway's Law prov. The rule that the organization of the software and the organization of the software team will be congruent;
  commonly stated as "If you have four groups working...
• In simple cases, presenting one obvious right way versus one obvious wrong way,
  it is often wiser to choose the wrong way, so as to...