How would a company manufacturing stainless steel pressure vessels address

the requirements of clause $8\mathrm{.}4$ Control of externally provided processes,

products and services of ISO $9001$:$2015?$

What controls would it have in place in$-$house relating to clause $8\mathrm{.}5\mathrm{.}2$

Identification and traceability?

Describe how a civil$/$structural engineering consultancy involved in designing

tunnels would implement clause $8\mathrm{.}3$ of ISO $9001$:$2105$: Design and

development of products and services.

How would a manufacturer of aerospace bolts satisfy the following clauses of

ISO $9001?$

i$)$ Clause $6\mathrm{.}3$ Planning of changes

ii$)$ Clause $8\mathrm{.}5\mathrm{.}6$ Control of changes

In your answer explain why the standard requires two change control clauses.