This page and the set of links available from this page are for the use of
scientists who would like to learn more about using Webb for their research
programs. A detailed description of the science capabilities and instruments
on Webb can be found in the Space Science Reviews paper (external link) by Gardner
et. al. A brief synopsis of the Webb science themes can be obtained here. White papers written by the JWST Science Working Group can be found here.
For technical information about the status, design and plans for Webb, you can go to http://spie.org and search for “webb" and "jwst”. On that site there are more than 500 technical articles about Webb. (Note there is a fee per article on that site without an institutional subscription.)
These plots and tables illustrate JWST sensitivity and compare to current observatories. The JWST exposure time calculators estimate integration times for given targets.
You may also be interested in visiting the Images & Videos section of
JWST: Observations of Mars [pdf]