[@2013ApJ...774...95D], and the mini-Neptune GJ 1214b [@2012ApJ...756..176H].

[*JWST*]{} will be capable of many spectroscopic observing modes (a particular filter and other optical elements on a given instrument), giving many options to take observations. We may define an observing program as a particular combination of observing modes and integration times with which to observe a particular object or set of objects.[^1]

Plots of the best available transit observations in multiple wavelength ranges for the best-studied objects HD 189733b and HD 209458b are shown in the top panels of Figure \[plot189-209\] to illustrate the quality of observations currently available. For comparison, simulated observations of the same objects with [*JWST*]{} are shown in the bottom panels. These simulated observations mostly have smaller error bars, more than an order of magnitude higher spectra resolution, and much more complete spectral coverage.

![image](hd189-209clean.eps){width="99.00000%"}

With the much greater quality and quantity of spectroscopic data anticipated from [*JWST*]{} and the large number of options for observations, it is important to find the modalities that will make the best use of observing time. In this paper, we seek to explore these possibilities to determine quantitatively the observing programs that provide the strongest constraints on the model parameters with the 