The phrase "rigid procedure" is correct and usable in written English.
You can use it to describe a process that is inflexible or strictly adheres to a specific set of rules. For example, "The company's hiring process involves a rigorous and rigid procedure to ensure only the best candidates are chosen."
He appreciated his orderliness and the way he ran the bureau with rigid procedures and an iron fist.
We know, for instance, some operating theatres have really efficient ways of working that meet the needs of patients, while others work to very rigid procedures.
In response, big open-source projects such as Linux, Apache and Mozilla have implemented rigid procedures so that they can attest to the origins of the code.
And yet, when the time came, these rigid procedures appeared to be adhered to blindly, with no one able to say exactly why this clean break approach was best, and nobody confident enough to try another way.
A new U.N. resolution will give Dr. Blix and the Unmovic team and the I.A.E.A. the most rigid procedures, the highest standards for Iraq to meet in order to satisfy the international community that they do not have or are not developing weapons of mass destruction, and that which they do have can be destroyed by Unmovic.
In the first instance, it appears that people overseeing the program were too cautious, so that top managers were left unaware of its existence; in the second, managers may have relied too much on rigid procedures at the expense of basic journalistic principles.
Normally it is not possible to compare two fluorescence intensity values taken from different CLSM images, unless rigid procedures are applied to remove differences in levels of background emission, degrees of enzyme labelling, thickness of CLSM slices or other differences in CLSM settings.
So these rigid procedures were designed to protect against disaster.
As an example, sales assistants have to follow rigid procedures that prevent them from creating custom tailored services for customers.
