As per PMBOK "An iterative relationship, where only one phase is planned at any given time and the planning for the next is carried out as work progresses on the current phase and deliverables. This approach is useful in largely undefined, uncertain, or rapidly changing environments such as research, but it can reduce the ability to provide long term planning The scope is then managed by continuously delivering increments of the product and prioritizing requirements to minimize project risks and maximize product business value. It also can entail having all of the project team members (e.g. designers, developers, etc.) available throughout the project or, at a minimum, for two consecutive phases."
Most of our projects which are nothing but a repeat of similar kind with no research & development practically are based on phased release of drawings and not on complete release of all the drawings pertaining to a package before start. There are various observations on the possibility of achieving the target of having all the drawings before we start a project and most of the time this is termed as a wishful thinking.
Seeing the rising cost of projects this has become mandatory to go for cost optimization by having timely delivery with better quality at cheaper price. This can only be achieved when the detailed drawings with proper material specifications, work methodologies and optimum time to execute is available with project & procurement team.
Availability of detailed drawwings & design prior to start of the project will not only help the procurement & quality team to comeup with various alternatives but will also allow the project team to mobilize efficient resources to execute. This will also result in a better planning inturn shall be helpful in avoiding the rework or wrong work or duplicity of work.
I personally would suggest that based on the past experience we should work out the optimum level of design and drawing to be made available to projects & procurement before floating the project so that an optimum time for cost optimization can be given and achieved.
A piece of thought - need to be looked into with more critical review.
Contributed by:- Gopaal Dhussa