how sensitive is this network for project managment slack?

$1.$ Market Analysis $1/2/15-2/6/15$

$2.$ Product Design $2/9/15-3/20/15$

$3.$ Manufacturing Study $3/23/15-4/17/15$

$4.$ Product Design Selection $4/20/15-5/1/15$

$5.$ Detailed Marketing Plan $5/4/15-5/22/15$

$6.$ Manufacturing Process $5/25/15-6/29/15$

$7.$ Detailed Product Design $6/30/15-9/1/15$

$8.$ Build Prototypes $9/2/15-10/6/15$

$9.$ Lab Test Prototypes $10/7/15-10/20/15$

$10.$ Field Test Prototypes $10/21/15-11/10/15$

$11.$ Finalized Product Design $11/11/15-12/09/15$

$12.$ Final Manufacture Process $12/10/15-12/24/15$

$13.$ Order Components $12/28/15-1/6/16$

$14.$ Order Production Equipment $1/7/16-1/27/16$

$15.$ Install Production Equipment $1/28/16-3/16/16$

$16.$ Celebrate $3/17/16-3/17/16$