1 Based on observations obtained at the Anglo-Australian Telescope.

A brief historical review of educational service delivery models for severely handicapped students is provided, six learning and performance characteristics and some of their educational implications are dis cussed, and four instructional location strategies and some of the pros and cons of each are also addressed.The thesis offered is that placement of severely hand icapped students in chronological age appropriate regular schools that are both close to their homes and in accordance with the natural proportion is necessary but not sufficient to prepare for acceptable function ing in vocational, domestic, recreation/leisure, and general community environments upon graduation at age 21. Educators and related service personnel must provide direct, individualized, longitudinal, com prehensive, and systematic instruction in a wide variety of heterogeneous nonschool environments.Indeed, decisions related to selection of nonschool instructional environments are considered so important that they should take precedence over those related to selection of skills, materials, and measurement systems.When educational services available to severely handicapped 2 students are examined, at least six overlapping phases can be identified.

Abstract. Lithium abundances, radial velocities, and rotational velocities are reported for 20 candidate F, G and K stars of the sparse Coma Berenices open cluster. All the stars are proper-motion selected, and our radial velocities support the membership credentials of at least 12 of the candidates. Combining our data with that in the literature, we have a close-to-complete census of Li abundances for late-type stars with M V < 5.8. These data show that the Li-depletion pattern in Coma Ber is similar, but not identical, to that in the Hyades cluster, which has a similar age but higher metallicity. Several Coma Ber F stars have suffered significantly more Li depletion than their counterparts in the Hyades. The G and early-K stars of Coma Ber have undergone less Li depletion than those of the Hyades, but much more than that predicted by standard evolutionary models featuring only convective mixing. This provides strong evidence for additional mixing and Li depletion operating in these stars during their first 400 Myr on the main sequence, amounting to 0.3 dex at 6000 K and rising to 0.8-1.2 dex at 5400 K. We find that 4 of the radial-velocity non-members are among a small number of low-mass stars which were previously reported as part of an extra-tidal moving group associated with the Coma Ber cluster. As a result, we now find that the luminosity function of this moving group is indistinguishable from that of the central cluster. It is uncertain whether there may be a significant number of stars with even lower masses among the moving group.

High resolution spectroscopy is used to determine the detailed chemical abundances of a group of eight F- and G-type stars in the young open cluster Blanco 1. An average [Fe/H] of +0.04 +/- 0.02 (internal error) +/- 0.04 (external error) is found, considerably lower than a previous spectroscopic estimate for this cluster. The difference is due mainly to our adoption of significantly cooler temperatures which are consistent with both photometric and spectroscopic constraints. Blanco~1 exhibits sub-solar [Ni/Fe] (-0.18 +/- 0.01 +/- 0.01), [Si/Fe] (-0.09$ +/- 0.02 +/- 0.03), [Mg/Fe] (-0.14 +/- 0.02 +/- 0.03) and [Ca/Fe] (-0.09 +/- 0.03 +/- 0.03); ratios which are not observed among nearby field stars. The material from which Blanco 1 formed may not have been well mixed with interstellar matter in the galactic disc, which tallies with its current location about 240pc below the galactic plane. A simultaneous deficit of Ni and alpha elements with respect to Fe is hard to reconcile with most published models of yields from supernovae of types Ia and II. The revised abundances for Blanco 1 indicate that overall radiative opacities in its stars, and hence convective zone properties at a given mass, are similar to those in the Pleiades at approximately the same age. This can explain a previous observation that the Li depletion patterns of G- and K-type stars in the two clusters are indistinguishable. The lower overall metallicity of Blanco 1 now make it less attractive as a target for discovering transiting, short period exoplanets.Comment: Accepted for MNRAS, 12 page