What is the best method of coordination between Mechanical drawing, Structural drawing and electrical drawing? => Elaboration of synthesis drawing?

well for me i tried the both of them and let me ask you a question 

if you are solving a function with only one variable (x) , and another function of ( X , Y ) , which of them will be applicable and easy to solve ?

sure solving a function with only one variable so no body able to work in design and coordination both in the same time it is better to finish the design then starting to make coordination.

the only way to make both together is using REVIT program and it must be connected to a server with all other trade to to see all modifications 

The coordination especially above false ceiling in commercial and residential buildings, basically through layering of all services in different colours by autocad drafting and thereafter rearranging the services as per the space availability, this is to be done by a dedicated and sincere mechanical draftman since mechanical services occupy more spaces above false ceiling.

Finally with the above said procedure is not over which happens in the engineering department, it is mandatory this coordinated drawing should be sent to the site during site execution of all services wherein minor adjustments to be done. The major coordination to be done at engineering dept and the rest to be done in the site by the site people. A team work without blaming each other is important in this activity. Very interesting job.

By make a composite drawing which contain all trades " Mechanical , Electric , Arch , Civil " all in one drawing with differences colors to obtain the conflicts between the trades and solve these conflicts by obtain the best soluation to solve these conflicts

Thank you for your replies Mr Mohamed and Mr Martin! I agree with you! but according to you, what most reliable method? we begin design with the superposition, ie all design drawing of all services are realized simultaneously in advance or each service is realized independently and then we supperpose the drawings?