A. The inputs that went into tool making:

(i) Increase in size and capacity of the brain

(ii) Hands freed for using tools and carrying infants, objects, etc.

(iii) Visual surveillance, long distance while foraging and hunting.

B. The processes that were strengthened by toolmaking:

(i) Created conditions for transition from scavenging to skilled hunting.

(ii) Visual surveillance, long distance walking while foraging and hunting.

(iii) Increase in size and capacity of the brain

(iv) Invention of punch blade to make small chisel.